diff --git a/acquisition_device/AcquisitionDevice.cpp b/acquisition_device/AcquisitionDevice.cpp
index 00fecac8..a422fb58 100644
--- a/acquisition_device/AcquisitionDevice.cpp
+++ b/acquisition_device/AcquisitionDevice.cpp
@@ -320,9 +320,14 @@ void AcquisitionDevice::RunInternalGenerator(const DiffractionExperiment &experi
 void AcquisitionDevice::SetSpotFinderParameters(const SpotFindingSettings &settings) {
     SpotFinderParameters fpga_parameters{};
 
+    // The FPGA compares d against these as xray_d_t = ap_ufixed<16,9> (hls_jfjoch.h), which tops out just
+    // below 512 A and WRAPS above it - so "no low-resolution limit" is that ceiling, not infinity. Sending
+    // a larger number would wrap to a small d and mask the whole image. The high end needs no such care:
+    // no pixel has d < 0.
+    constexpr float FPGA_MAX_D_A = 511.0f;
     fpga_parameters.snr_threshold = settings.signal_to_noise_threshold;
     fpga_parameters.count_threshold = settings.photon_count_threshold;
-    fpga_parameters.max_d = settings.low_resolution_limit;
+    fpga_parameters.max_d = settings.low_resolution_limit.value_or(FPGA_MAX_D_A);
     fpga_parameters.min_d = settings.high_resolution_limit.value_or(0.0f);
     fpga_parameters.min_pix_per_spot = settings.min_pix_per_spot.value_or(2);
     HW_SetSpotFinderParameters(fpga_parameters);
diff --git a/broker/OpenAPIConvert.cpp b/broker/OpenAPIConvert.cpp
index 50a2bf06..7fe98181 100644
--- a/broker/OpenAPIConvert.cpp
+++ b/broker/OpenAPIConvert.cpp
@@ -16,9 +16,13 @@ SpotFindingSettings Convert(const org::openapitools::server::model::Spot_finding
     ret.photon_count_threshold = input.getPhotonCountThreshold();
     ret.min_pix_per_spot = input.getMinPixPerSpot();
     ret.max_pix_per_spot = input.getMaxPixPerSpot();
-    if (input.highResolutionLimitIsSet())
+    // Both limits are optional and unset means "no limit at that end". A value of 0 has meant the same
+    // thing since rc.161 and clients still send it that way, so fold it into the unset case here - the
+    // analysis code then has exactly one spelling for "no limit" and no zero to special-case.
+    if (input.highResolutionLimitIsSet() && input.getHighResolutionLimit() > 0)
         ret.high_resolution_limit = input.getHighResolutionLimit();
-    ret.low_resolution_limit = input.getLowResolutionLimit();
+    if (input.lowResolutionLimitIsSet() && input.getLowResolutionLimit() > 0)
+        ret.low_resolution_limit = input.getLowResolutionLimit();
     ret.enable = input.isEnable();
     ret.indexing = input.isIndexing();
     ret.quick_integration = input.isQuickIntegration();
@@ -41,7 +45,8 @@ org::openapitools::server::model::Spot_finding_settings Convert(const SpotFindin
     ret.setMaxPixPerSpot(input.max_pix_per_spot);
     if (input.high_resolution_limit.has_value())
         ret.setHighResolutionLimit(input.high_resolution_limit.value());
-    ret.setLowResolutionLimit(input.low_resolution_limit);
+    if (input.low_resolution_limit.has_value())
+        ret.setLowResolutionLimit(input.low_resolution_limit.value());
     ret.setEnable(input.enable);
     ret.setIndexing(input.indexing);
     ret.setHighResolutionLimitForSpotCountLowRes(input.cutoff_spot_count_low_res);
diff --git a/broker/gen/model/Spot_finding_settings.cpp b/broker/gen/model/Spot_finding_settings.cpp
index d85be081..e96079f1 100644
--- a/broker/gen/model/Spot_finding_settings.cpp
+++ b/broker/gen/model/Spot_finding_settings.cpp
@@ -30,6 +30,7 @@ Spot_finding_settings::Spot_finding_settings()
     m_High_resolution_limit = 0.0f;
     m_High_resolution_limitIsSet = false;
     m_Low_resolution_limit = 0.0f;
+    m_Low_resolution_limitIsSet = false;
     m_High_resolution_limit_for_spot_count_low_res = 0.0f;
     m_Quick_integration = false;
     m_Ice_ring_width_q_recipA = 0.03f;
@@ -223,8 +224,8 @@ bool Spot_finding_settings::operator==(const Spot_finding_settings& rhs) const
     
     ((!highResolutionLimitIsSet() && !rhs.highResolutionLimitIsSet()) || (highResolutionLimitIsSet() && rhs.highResolutionLimitIsSet() && getHighResolutionLimit() == rhs.getHighResolutionLimit())) &&
     
-    (getLowResolutionLimit() == rhs.getLowResolutionLimit())
-     &&
+    
+    ((!lowResolutionLimitIsSet() && !rhs.lowResolutionLimitIsSet()) || (lowResolutionLimitIsSet() && rhs.lowResolutionLimitIsSet() && getLowResolutionLimit() == rhs.getLowResolutionLimit())) &&
     
     (getHighResolutionLimitForSpotCountLowRes() == rhs.getHighResolutionLimitForSpotCountLowRes())
      &&
@@ -263,7 +264,8 @@ void to_json(nlohmann::json& j, const Spot_finding_settings& o)
     j["max_pix_per_spot"] = o.m_Max_pix_per_spot;
     if(o.highResolutionLimitIsSet())
         j["high_resolution_limit"] = o.m_High_resolution_limit;
-    j["low_resolution_limit"] = o.m_Low_resolution_limit;
+    if(o.lowResolutionLimitIsSet())
+        j["low_resolution_limit"] = o.m_Low_resolution_limit;
     j["high_resolution_limit_for_spot_count_low_res"] = o.m_High_resolution_limit_for_spot_count_low_res;
     j["quick_integration"] = o.m_Quick_integration;
     j["ice_ring_width_q_recipA"] = o.m_Ice_ring_width_q_recipA;
@@ -289,7 +291,11 @@ void from_json(const nlohmann::json& j, Spot_finding_settings& o)
         j.at("high_resolution_limit").get_to(o.m_High_resolution_limit);
         o.m_High_resolution_limitIsSet = true;
     } 
-    j.at("low_resolution_limit").get_to(o.m_Low_resolution_limit);
+    if(j.find("low_resolution_limit") != j.end())
+    {
+        j.at("low_resolution_limit").get_to(o.m_Low_resolution_limit);
+        o.m_Low_resolution_limitIsSet = true;
+    } 
     j.at("high_resolution_limit_for_spot_count_low_res").get_to(o.m_High_resolution_limit_for_spot_count_low_res);
     j.at("quick_integration").get_to(o.m_Quick_integration);
     j.at("ice_ring_width_q_recipA").get_to(o.m_Ice_ring_width_q_recipA);
@@ -383,6 +389,15 @@ float Spot_finding_settings::getLowResolutionLimit() const
 void Spot_finding_settings::setLowResolutionLimit(float const value)
 {
     m_Low_resolution_limit = value;
+    m_Low_resolution_limitIsSet = true;
+}
+bool Spot_finding_settings::lowResolutionLimitIsSet() const
+{
+    return m_Low_resolution_limitIsSet;
+}
+void Spot_finding_settings::unsetLow_resolution_limit()
+{
+    m_Low_resolution_limitIsSet = false;
 }
 float Spot_finding_settings::getHighResolutionLimitForSpotCountLowRes() const
 {
diff --git a/broker/gen/model/Spot_finding_settings.h b/broker/gen/model/Spot_finding_settings.h
index 63838b1b..873d2d09 100644
--- a/broker/gen/model/Spot_finding_settings.h
+++ b/broker/gen/model/Spot_finding_settings.h
@@ -95,10 +95,12 @@ public:
     bool highResolutionLimitIsSet() const;
     void unsetHigh_resolution_limit();
     /// <summary>
-    /// Low resolution limit for spot finding [Angstrom]
+    /// Low resolution limit for spot finding [Angstrom]. Optional: if omitted, spot finding is not clipped at the low-resolution end. A value of 0 is accepted and means the same thing. 
     /// </summary>
     float getLowResolutionLimit() const;
     void setLowResolutionLimit(float const value);
+    bool lowResolutionLimitIsSet() const;
+    void unsetLow_resolution_limit();
     /// <summary>
     /// High resolution threshold to consider spot \&quot;low resolution\&quot; [Angstrom]
     /// </summary>
@@ -154,7 +156,7 @@ protected:
     float m_High_resolution_limit;
     bool m_High_resolution_limitIsSet;
     float m_Low_resolution_limit;
-
+    bool m_Low_resolution_limitIsSet;
     float m_High_resolution_limit_for_spot_count_low_res;
 
     bool m_Quick_integration;
diff --git a/broker/jfjoch_api.yaml b/broker/jfjoch_api.yaml
index eb75e3ea..236eee22 100644
--- a/broker/jfjoch_api.yaml
+++ b/broker/jfjoch_api.yaml
@@ -1038,7 +1038,6 @@ components:
         - photon_count_threshold
         - max_pix_per_spot
         - min_pix_per_spot
-        - low_resolution_limit
         - quick_integration
         - high_resolution_limit_for_spot_count_low_res
         - ice_ring_width_q_recipA
@@ -1079,7 +1078,9 @@ components:
         low_resolution_limit:
           type: number
           format: float
-          description: Low resolution limit for spot finding [Angstrom]
+          description: |
+            Low resolution limit for spot finding [Angstrom]. Optional: if omitted, spot finding is not
+            clipped at the low-resolution end. A value of 0 is accepted and means the same thing.
         high_resolution_limit_for_spot_count_low_res:
           type: number
           format: float
diff --git a/broker/redoc-static.html b/broker/redoc-static.html
index 7d084587..f40ccb83 100644
--- a/broker/redoc-static.html
+++ b/broker/redoc-static.html
@@ -710,7 +710,8 @@ Even if disabled spot finding information will still be send and written, though
 </div></div></div></td></tr><tr class=""><td class="sc-dLMFU sc-eldPxv hZbWKe jXkfaY" kind="field" title="indexing"><span class="sc-gFqAkR eRqgPI"></span><span class="property-name">indexing</span><div class="sc-Nxspf sc-hRJfrW cXxAXt kYVhSL">required</div></td><td class="sc-fPXMVe bAXEAa"><div><div><span class="sc-Nxspf sc-cfxfcM cXxAXt jrGEaR"></span><span class="sc-Nxspf sc-gFAWRd cXxAXt dYzdDr">boolean</span></div><div><span class="sc-Nxspf cXxAXt"> <!-- -->Default:<!-- --> </span> <span class="sc-Nxspf sc-ddjGPC cXxAXt jZOCAW">true</span></div> <div><div class="sc-eeDRCY sc-eBMEME gTGgei fbXBig"><p>Enable indexing. This is temporary setting, i.e. can be changed anytime during data collection.</p>
 </div></div></div></td></tr><tr class=""><td class="sc-dLMFU sc-eldPxv hZbWKe jXkfaY" kind="field" title="signal_to_noise_threshold"><span class="sc-gFqAkR eRqgPI"></span><span class="property-name">signal_to_noise_threshold</span><div class="sc-Nxspf sc-hRJfrW cXxAXt kYVhSL">required</div></td><td class="sc-fPXMVe bAXEAa"><div><div><span class="sc-Nxspf sc-cfxfcM cXxAXt jrGEaR"></span><span class="sc-Nxspf sc-gFAWRd cXxAXt dYzdDr">number</span><span class="sc-Nxspf sc-gFAWRd cXxAXt dYzdDr"> <!-- -->&lt;<!-- -->float<!-- -->&gt;<!-- --> </span><span> <span class="sc-Nxspf sc-fxwrCY cXxAXt eMVOei"> <!-- -->&gt;= 0<!-- --> </span></span></div> <div><div class="sc-eeDRCY sc-eBMEME gTGgei fbXBig"></div></div></div></td></tr><tr class=""><td class="sc-dLMFU sc-eldPxv hZbWKe jXkfaY" kind="field" title="photon_count_threshold"><span class="sc-gFqAkR eRqgPI"></span><span class="property-name">photon_count_threshold</span><div class="sc-Nxspf sc-hRJfrW cXxAXt kYVhSL">required</div></td><td class="sc-fPXMVe bAXEAa"><div><div><span class="sc-Nxspf sc-cfxfcM cXxAXt jrGEaR"></span><span class="sc-Nxspf sc-gFAWRd cXxAXt dYzdDr">integer</span><span class="sc-Nxspf sc-gFAWRd cXxAXt dYzdDr"> <!-- -->&lt;<!-- -->int64<!-- -->&gt;<!-- --> </span><span> <span class="sc-Nxspf sc-fxwrCY cXxAXt eMVOei"> <!-- -->&gt;= 0<!-- --> </span></span></div> <div><div class="sc-eeDRCY sc-eBMEME gTGgei fbXBig"></div></div></div></td></tr><tr class=""><td class="sc-dLMFU sc-eldPxv hZbWKe jXkfaY" kind="field" title="min_pix_per_spot"><span class="sc-gFqAkR eRqgPI"></span><span class="property-name">min_pix_per_spot</span><div class="sc-Nxspf sc-hRJfrW cXxAXt kYVhSL">required</div></td><td class="sc-fPXMVe bAXEAa"><div><div><span class="sc-Nxspf sc-cfxfcM cXxAXt jrGEaR"></span><span class="sc-Nxspf sc-gFAWRd cXxAXt dYzdDr">integer</span><span class="sc-Nxspf sc-gFAWRd cXxAXt dYzdDr"> <!-- -->&lt;<!-- -->int64<!-- -->&gt;<!-- --> </span><span> <span class="sc-Nxspf sc-fxwrCY cXxAXt eMVOei"> <!-- -->&gt;= 1<!-- --> </span></span></div> <div><div class="sc-eeDRCY sc-eBMEME gTGgei fbXBig"></div></div></div></td></tr><tr class=""><td class="sc-dLMFU sc-eldPxv hZbWKe jXkfaY" kind="field" title="max_pix_per_spot"><span class="sc-gFqAkR eRqgPI"></span><span class="property-name">max_pix_per_spot</span><div class="sc-Nxspf sc-hRJfrW cXxAXt kYVhSL">required</div></td><td class="sc-fPXMVe bAXEAa"><div><div><span class="sc-Nxspf sc-cfxfcM cXxAXt jrGEaR"></span><span class="sc-Nxspf sc-gFAWRd cXxAXt dYzdDr">integer</span><span class="sc-Nxspf sc-gFAWRd cXxAXt dYzdDr"> <!-- -->&lt;<!-- -->int64<!-- -->&gt;<!-- --> </span><span> <span class="sc-Nxspf sc-fxwrCY cXxAXt eMVOei"> <!-- -->&gt;= 1<!-- --> </span></span></div> <div><div class="sc-eeDRCY sc-eBMEME gTGgei fbXBig"></div></div></div></td></tr><tr class=""><td class="sc-dLMFU sc-eldPxv hZbWKe jXkfaY" kind="field" title="high_resolution_limit"><span class="sc-gFqAkR eRqgPI"></span><span class="property-name">high_resolution_limit</span></td><td class="sc-fPXMVe bAXEAa"><div><div><span class="sc-Nxspf sc-cfxfcM cXxAXt jrGEaR"></span><span class="sc-Nxspf sc-gFAWRd cXxAXt dYzdDr">number</span><span class="sc-Nxspf sc-gFAWRd cXxAXt dYzdDr"> <!-- -->&lt;<!-- -->float<!-- -->&gt;<!-- --> </span></div> <div><div class="sc-eeDRCY sc-eBMEME gTGgei fbXBig"><p>High resolution limit for spot finding [Angstrom]. Optional: if omitted, spot finding extends
 as far as the detector reaches, i.e. the detection is not clipped in resolution.</p>
-</div></div></div></td></tr><tr class=""><td class="sc-dLMFU sc-eldPxv hZbWKe jXkfaY" kind="field" title="low_resolution_limit"><span class="sc-gFqAkR eRqgPI"></span><span class="property-name">low_resolution_limit</span><div class="sc-Nxspf sc-hRJfrW cXxAXt kYVhSL">required</div></td><td class="sc-fPXMVe bAXEAa"><div><div><span class="sc-Nxspf sc-cfxfcM cXxAXt jrGEaR"></span><span class="sc-Nxspf sc-gFAWRd cXxAXt dYzdDr">number</span><span class="sc-Nxspf sc-gFAWRd cXxAXt dYzdDr"> <!-- -->&lt;<!-- -->float<!-- -->&gt;<!-- --> </span></div> <div><div class="sc-eeDRCY sc-eBMEME gTGgei fbXBig"><p>Low resolution limit for spot finding [Angstrom]</p>
+</div></div></div></td></tr><tr class=""><td class="sc-dLMFU sc-eldPxv hZbWKe jXkfaY" kind="field" title="low_resolution_limit"><span class="sc-gFqAkR eRqgPI"></span><span class="property-name">low_resolution_limit</span></td><td class="sc-fPXMVe bAXEAa"><div><div><span class="sc-Nxspf sc-cfxfcM cXxAXt jrGEaR"></span><span class="sc-Nxspf sc-gFAWRd cXxAXt dYzdDr">number</span><span class="sc-Nxspf sc-gFAWRd cXxAXt dYzdDr"> <!-- -->&lt;<!-- -->float<!-- -->&gt;<!-- --> </span></div> <div><div class="sc-eeDRCY sc-eBMEME gTGgei fbXBig"><p>Low resolution limit for spot finding [Angstrom]. Optional: if omitted, spot finding is not
+clipped at the low-resolution end. A value of 0 is accepted and means the same thing.</p>
 </div></div></div></td></tr><tr class=""><td class="sc-dLMFU sc-eldPxv hZbWKe jXkfaY" kind="field" title="high_resolution_limit_for_spot_count_low_res"><span class="sc-gFqAkR eRqgPI"></span><span class="property-name">high_resolution_limit_for_spot_count_low_res</span><div class="sc-Nxspf sc-hRJfrW cXxAXt kYVhSL">required</div></td><td class="sc-fPXMVe bAXEAa"><div><div><span class="sc-Nxspf sc-cfxfcM cXxAXt jrGEaR"></span><span class="sc-Nxspf sc-gFAWRd cXxAXt dYzdDr">number</span><span class="sc-Nxspf sc-gFAWRd cXxAXt dYzdDr"> <!-- -->&lt;<!-- -->float<!-- -->&gt;<!-- --> </span><span> <span class="sc-Nxspf sc-fxwrCY cXxAXt eMVOei"> <!-- -->[ 2 .. 8 ]<!-- --> </span></span></div> <div><div class="sc-eeDRCY sc-eBMEME gTGgei fbXBig"><p>High resolution threshold to consider spot &quot;low resolution&quot; [Angstrom]</p>
 </div></div></div></td></tr><tr class=""><td class="sc-dLMFU sc-eldPxv hZbWKe jXkfaY" kind="field" title="quick_integration"><span class="sc-gFqAkR eRqgPI"></span><span class="property-name">quick_integration</span><div class="sc-Nxspf sc-hRJfrW cXxAXt kYVhSL">required</div></td><td class="sc-fPXMVe bAXEAa"><div><div><span class="sc-Nxspf sc-cfxfcM cXxAXt jrGEaR"></span><span class="sc-Nxspf sc-gFAWRd cXxAXt dYzdDr">boolean</span></div><div><span class="sc-Nxspf cXxAXt"> <!-- -->Default:<!-- --> </span> <span class="sc-Nxspf sc-ddjGPC cXxAXt jZOCAW">false</span></div> <div><div class="sc-eeDRCY sc-eBMEME gTGgei fbXBig"><p>Quick integration of Bragg spots in diffraction images.
 If enabled it will likely reduce performance of Jungfraujoch for datasets with a very high indexing rate.
@@ -976,7 +977,7 @@ then image might be replaced in the buffer between calling /images and /image.cb
 </div></button></div></div></div><div class="sc-iGgWBj sc-gsFSXq ibAZSi eDeKjd"><div class="sc-ejfMa-d bNUPQg"><button class="sc-EgOXT cFEcOl"><span type="get" class="sc-eZYNyq qGfV http-verb get">get</span><span class="sc-iEXKAA gUNSDu">/version</span><svg class="sc-cwHptR iVFMLx" style="margin-right:-25px" version="1.1" viewBox="0 0 24 24" x="0" xmlns="http://www.w3.org/2000/svg" y="0" aria-hidden="true"><polygon points="17.3 8.3 12 13.6 6.7 8.3 5.3 9.7 12 16.4 18.7 9.7 "></polygon></svg></button><div aria-hidden="true" class="sc-dlWCHZ kWacYr"><div class="sc-hHOBiw cndTNO"><div class="sc-eeDRCY sc-eBMEME gTGgei fbXBig"><p>Test Jungfraujoch system</p>
 </div><div tabindex="0" role="button"><div class="sc-kWtpeL gEncxT"><span>http://localhost:5232</span>/version</div></div></div></div></div></div></div></div></div><div class="sc-dExYaf gZbfaQ"></div></div></div>
       <script>
-      const __redoc_state = {"menu":{"activeItemIdx":-1},"spec":{"data":{"openapi":"3.0.3","info":{"title":"Jungfraujoch","description":"API to control Jungfraujoch developed by the Paul Scherrer Institute (Switzerland).\nJungfraujoch is a data acquisition and analysis system for pixel array detectors, primarly PSI JUNGFRAU.\nJungfraujoch uses FPGA boards to acquire data at high data rates.\n\n# License Clarification\n\nWhile this API definition is licensed under GPL-3.0, **the GPL copyleft provisions do not apply**\nwhen this file is used solely to generate OpenAPI clients or when implementing applications that\ninteract with the API. Generated client code and applications using this API definition are not\nsubject to the GPL license requirements and may be distributed under terms of your choosing.\n\nThis exception is similar in spirit to the Linux Kernel's approach to userspace API headers and\nthe GCC Runtime Library Exception. The Linux Kernel developers have explicitly stated that\nuser programs that merely use the kernel interfaces (syscalls, ioctl definitions, etc.) are not\nderivative works of the kernel and are not subject to the terms of the GPL.\n\nThis exception is intended to allow wider use of this API specification without imposing GPL\nrequirements on applications that merely interact with the API, regardless of whether they\ncommunicate through network calls or other mechanisms.\n","version":"1.0.0-rc.161","contact":{"name":"Filip Leonarski (Paul Scherrer Institute)","email":"filip.leonarski@psi.ch"},"license":{"name":"GPL-3.0","url":"https://www.gnu.org/licenses/gpl-3.0.html"}},"servers":[{"url":"http://localhost:5232","description":"Test Jungfraujoch system"}],"components":{"parameters":{"binning":{"in":"query","name":"binning","required":false,"schema":{"default":1,"type":"integer"},"description":"Binning of frames for the plot (0 = default binning)"},"experimental_coord":{"in":"query","name":"experimental_coord","required":false,"schema":{"type":"boolean","default":false},"description":"If measurement has goniometer axis defined, plot X-axis will represent rotation angle\nIf measurement has grid scan defined, plot X-axis and Y-axis will represent grid position, Z will be used as the final value\nFor still measurement the number is ignored\n"},"azint_unit":{"in":"query","name":"azint_unit","required":false,"schema":{"type":"string","enum":["Q_recipA","d_A","two_theta_deg"],"default":"Q_recipA"},"description":"Unit used for azim int.\n"},"fill_value":{"in":"query","name":"fill","required":false,"schema":{"type":"number","format":"float"},"description":"Fill value for elements that were missed during data collection\n"},"plot_type":{"in":"query","name":"type","required":true,"description":"Type of requested plot","schema":{"type":"string","enum":["bkg_estimate","azint","azint_1d","spot_count","spot_count_low_res","spot_count_indexed","spot_count_ice","indexing_rate","indexing_lattice_count","indexing_unit_cell_length","indexing_unit_cell_angle","profile_radius","mosaicity","b_factor","error_pixels","saturated_pixels","image_collection_efficiency","receiver_delay","receiver_free_send_buf","strong_pixels","roi_sum","roi_mean","roi_max_count","roi_pixels","roi_weighted_x","roi_weighted_y","packets_received","max_pixel_value","resolution_estimate","pixel_sum","processing_time","beam_center_x","beam_center_y","integrated_reflections","image_scale_factor","image_scale_cc","compression_ratio","ice_ring_score"]}},"roi":{"in":"query","name":"roi","required":false,"schema":{"type":"string","minLength":1},"description":"Name of ROI for which plot is requested"},"image_id":{"in":"query","name":"id","required":false,"schema":{"type":"integer","format":"int64","default":-1,"minimum":-2},"description":"Image ID in the image buffer. Special values: -1 - last image in the buffer, -2: last indexed image in the buffer"},"saturation":{"in":"query","name":"saturation","required":false,"schema":{"type":"number","format":"float","minimum":-32767,"maximum":32767},"description":"Saturation value to set contrast in the preview image; if not provided, then autocontrast procedure is used"},"background":{"in":"query","name":"background","required":false,"schema":{"type":"number","format":"float","default":0,"minimum":-32767,"maximum":32767},"description":"Background value to set contrast in the preview image"},"show_spots":{"in":"query","name":"show_spots","schema":{"type":"boolean","default":true},"description":"Show spot finding results on the image"},"show_predictions":{"in":"query","name":"show_predictions","schema":{"type":"boolean","default":false},"description":"Show Bragg spot predictions on the image (if available for the image)"},"show_beam_center":{"in":"query","name":"show_beam_center","schema":{"type":"boolean","default":true},"description":"Show beam center on the image"},"show_roi":{"in":"query","name":"show_roi","schema":{"type":"boolean","default":false},"description":"Show ROI areas on the image"},"jpeg_quality":{"in":"query","name":"jpeg_quality","description":"Quality of JPEG image (100 - highest; 0 - lowest)","schema":{"type":"integer","format":"int64","default":100,"minimum":0,"maximum":100}},"show_user_mask":{"in":"query","name":"show_user_mask","schema":{"type":"boolean","default":false},"description":"Show user mask"},"resolution_ring":{"in":"query","name":"show_res_ring","description":"Show resolution ring, provided in Angstrom","schema":{"type":"number","format":"float","default":0.1,"minimum":0.1,"maximum":100}},"resolution_estimate":{"in":"query","name":"show_res_est","description":"Show resolution estimation as a ring","schema":{"type":"boolean","default":false}},"color_scale":{"in":"query","name":"color","description":"Color scale for preview image","schema":{"type":"string","enum":["indigo","viridis","bw","wb","green","heat","magma","inferno"],"default":"indigo"}}},"schemas":{"grid_scan":{"description":"Definition of a grid scan (mutually exclusive with `rotation_axis`)","type":"object","required":["n_fast","step_x_um","step_y_um"],"properties":{"n_fast":{"type":"integer","format":"int64","minimum":1,"example":20,"description":"Number of elements in the fast direction"},"step_x_um":{"type":"number","format":"float","example":5,"description":"Step in grid along the fast direction. 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If left empty, no file will be saved."},"images_per_file":{"type":"integer","format":"int64","minimum":0,"default":1000,"description":"Number of files in a single HDF5 data file (0 = write all images to a single data file)."},"space_group_number":{"type":"integer","format":"int64","minimum":1,"maximum":194,"description":"Number of space group for the crystal. Currently used solely as metadata, not relevant for image processing done in Jungfraujoch."},"sample_name":{"type":"string","default":"","description":"/entry/sample/name in NXmx\nSample name\n"},"compression":{"type":"string","enum":["bslz4","bszstd","bszstd_rle","bszstd_rlehuf","none"],"default":"bslz4","description":"Compression type for the images transferred over ZeroMQ and saved to HDF5 file.\n"},"total_flux":{"type":"number","format":"float","description":"/entry/beam/total_flux in NXmx\nFlux incident on beam plane in photons per second. In other words this is the flux integrated over area. [photons/s]\n"},"transmission":{"type":"number","format":"float","minimum":0,"maximum":1,"description":"/entry/instrument/attenuator/attenuator_transmission\nTransmission of attenuator (filter) [no units]\n"},"goniometer":{"$ref":"#/components/schemas/rotation_axis"},"grid_scan":{"$ref":"#/components/schemas/grid_scan"},"header_appendix":{"description":"Header appendix, added as user_data/user to start ZeroMQ message (can be any valid JSON)\nIn general, it is not saved in HDF5 file.\n\nHowever, if values are placed in \"hdf5\" object, `jfjoch_writer` will write them in /entry/user of the HDF5 file. \nThis applies solely to string and number (double floating-point). 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Units of angstrom and degree","required":["a","b","c","alpha","beta","gamma"],"properties":{"a":{"type":"number","format":"float","example":37,"minimum":0},"b":{"type":"number","format":"float","example":37,"minimum":0},"c":{"type":"number","format":"float","example":78,"minimum":0},"alpha":{"type":"number","format":"float","example":90,"minimum":0,"maximum":360},"beta":{"type":"number","format":"float","example":90,"minimum":0,"maximum":360},"gamma":{"type":"number","format":"float","example":90,"minimum":0,"maximum":360}}},"file_writer_format":{"type":"string","enum":["NXmxOnlyData","NXmxLegacy","NXmxVDS","NXmxIntegrated","CBF","TIFF","NoFileWritten"],"default":"NXmxLegacy","description":"NoFileWritten - no files are written at all\nNXmxOnlyData - only data files are written, no master file\nNXmxLegacy - legacy format with soft links to data files in the master file; necessary for DECTRIS Albula 4.0 and DECTRIS Neggia\nNXmxVDS - newer format with virtual dataset linking data files in the master file, also includes better metadata handling\nNXmxIntegrated - single HDF5 per dataset\nCBF - DEPRECATED, no longer supported; kept for back compatibility only. Requests using this value are rejected. Only HDF5 formats are written.\nTIFF - DEPRECATED, no longer supported; kept for back compatibility only. Requests using this value are rejected. Only HDF5 formats are written.\n"},"file_writer_settings":{"type":"object","properties":{"overwrite":{"type":"boolean","default":false,"description":"Inform jfjoch_write to overwrite existing files. Otherwise files would be saved with .h5.{timestamp}.tmp suffix.\n"},"format":{"$ref":"#/components/schemas/file_writer_format"}}},"pixel_mask_statistics":{"type":"object","properties":{"user_mask":{"description":"Number of pixels masked using the user mask","type":"integer","format":"int64","minimum":0},"too_high_pedestal_rms":{"description":"Number of pixels with G0 pedestal RMS higher than provided threshold","type":"integer","format":"int64","minimum":0},"wrong_gain":{"description":"Number of pixels that show wrong gain level during the pedestal procedure","type":"integer","format":"int64","minimum":0}}},"image_buffer_status":{"type":"object","required":["image_numbers","total_slots","in_preparation_slots","in_sending_slots","available_slots","max_image_number","min_image_number"],"properties":{"min_image_number":{"type":"integer","format":"int64","minimum":0,"description":"Smallest image number available in the buffer"},"max_image_number":{"type":"integer","format":"int64","minimum":0,"description":"Largest image number available in the buffer"},"image_numbers":{"type":"array","description":"Image numbers currently present in the buffer.","items":{"type":"integer","format":"int64"}},"total_slots":{"type":"integer","format":"int64","description":"Number of slots in the image buffer. This number, compared to number of images in data collection and\nframe rate will determine \"retention\" rate of the image buffer.\n"},"available_slots":{"type":"integer","format":"int64","description":"Slots available for the data collection"},"in_preparation_slots":{"type":"integer","format":"int64","description":"Number of slots in the image buffer that are currently in preparation for sending.\n"},"in_sending_slots":{"type":"integer","format":"int64","description":"Number of slots in the image buffer that are currently sending/writing data.\n"},"current_counter":{"type":"integer","format":"int64","description":"Counter of changes in the image buffer - either new start message or new image added.\nFor optimization one can only load new images/datasets from the HTTP if this value changes.\nCounter is optional as it was not implemented in older versions to avoid breaking change\n"}}},"image_format_settings":{"type":"object","required":["summation","jungfrau_conversion","geometry_transform","mask_chip_edges","mask_module_edges","apply_mask"],"properties":{"summation":{"type":"boolean","description":"Enable summation of images to a given image_time\nIf disabled images are saved according to original detector speed, but image count is adjusted\n"},"geometry_transform":{"type":"boolean","description":"Place module read-out into their location on composed detector and extend multipixels\n"},"jungfrau_conversion":{"type":"boolean","description":"Convert pixel value in ADU to photon counts/energy\nOnly affects JUNGFRAU detector\n"},"jungfrau_conversion_factor_keV":{"type":"number","format":"float","minimum":0.001,"maximum":500,"description":"Used to convert energy deposited into pixel to counts\nIf not provided incident_energy_keV is used\n"},"bit_depth_image":{"type":"integer","format":"int64","enum":[8,16,32],"description":"Bit depth of resulting image (it doesn't affect the detector read-out value)\nIf not provided value is adjusted automatically\n"},"signed_output":{"type":"boolean","description":"Controls if pixels have signed output\nIf not provided value is adjusted automatically\n"},"mask_module_edges":{"type":"boolean","default":true,"description":"Mask 1 pixel on the module boundary\n"},"mask_chip_edges":{"type":"boolean","default":true,"description":"Mask multipixels on chip boundary\n"},"jungfrau_mask_pixels_without_g0":{"type":"boolean","default":true,"description":"JUNGFRAU: mask pixels that don't operate in G0, but do operate in G1 and G1.\nThis should be turned off for cases, where detector is operated at room temperature with long exposure time.\n"},"apply_mask":{"type":"boolean","default":false,"description":"Masked pixels are set to special value in the images produced by Jungfraujoch\n"},"jungfrau_pedestal_g0_rms_limit":{"type":"integer","format":"int64","default":100,"minimum":0,"description":"Pixels with pedestal G0 RMS above the threshold are marked as masked pixels"}}},"detector_power_state":{"type":"string","description":"Power on of ASICs","enum":["PowerOn","PowerOff","Partial"]},"detector_state":{"type":"string","description":"Current state of the detector","enum":["Idle","Waiting","Busy","Error","Not connected"]},"detector_status":{"type":"object","required":["state","powerchip","server_version","number_of_triggers_left","fpga_temp_degC","high_voltage_V"],"properties":{"state":{"$ref":"#/components/schemas/detector_state"},"powerchip":{"$ref":"#/components/schemas/detector_power_state"},"server_version":{"type":"string","description":"Detector server (on read-out boards) version"},"number_of_triggers_left":{"type":"integer","format":"int64","description":"Remaining triggers to the detector (max of all modules)"},"fpga_temp_degC":{"type":"array","description":"Temperature of detector FPGAs","items":{"type":"integer","format":"int64"}},"high_voltage_V":{"type":"array","description":"High voltage for detector modules","items":{"type":"integer","format":"int64"}}}},"detector_timing":{"type":"string","enum":["auto","trigger","burst","gated"],"default":"trigger"},"detector_settings":{"type":"object","required":["frame_time_us"],"properties":{"frame_time_us":{"type":"integer","description":"Interval between consecutive frames.\nThis is internal frame time for the JUNGFRAU detector, image time has to be integer multiply of this number.\nFor EIGER detector this is default frame time, not used otherwise\n","format":"int64","minimum":1},"count_time_us":{"type":"integer","description":"Integration time of the detector. \nIf not provided count time will be set to maximum value for a given frame time.\n","format":"int64"},"internal_frame_generator":{"type":"boolean","default":false,"description":"Use internal frame generator in FPGA instead of getting data from a real detector"},"internal_frame_generator_images":{"type":"integer","format":"int64","default":1,"minimum":1,"maximum":64,"description":"Number of images stored in the internal frame generator."},"detector_trigger_delay_ns":{"type":"integer","format":"int64","minimum":0,"default":0,"description":"Delay between TTL trigger and acquisition start [ns]"},"timing":{"$ref":"#/components/schemas/detector_timing"},"eiger_threshold_keV":{"type":"number","format":"float","minimum":1,"maximum":100,"description":"Threshold for the PSI EIGER detector and all DECTRIS detectors.\nIf value is provided, it will be used for all subsequent acquisitions, irrespective of beam energy.\nIf value is not provided, threshold will be determined on start of acquisition as half of incident energy. \nThis might lead to increased start time.\n"},"eiger_bit_depth":{"type":"integer","format":"int64","enum":[8,16,32],"description":"Bit depth of PSI EIGER read-out. This is  \nIf value is not provided, depth will be determined based on the image time:\n* Exposure time < 500 microseconds depth of 8 bit will be used,\n* 500 <= exposure time < 2622 microseconds depth of 16 bit will be used\n* Exposure time >= 2622 microseconds depth of 32 bit will be used.\n"},"jungfrau_pedestal_g0_frames":{"type":"integer","format":"int64","default":2000,"minimum":0},"jungfrau_pedestal_g1_frames":{"type":"integer","format":"int64","default":300,"minimum":0},"jungfrau_pedestal_g2_frames":{"type":"integer","format":"int64","default":300,"minimum":0},"jungfrau_pedestal_min_image_count":{"type":"integer","format":"int64","default":128,"minimum":32,"description":"Minimum number of collected images for pedestal to consider it viable"},"jungfrau_storage_cell_count":{"type":"integer","format":"int64","default":1,"minimum":1,"maximum":16},"jungfrau_storage_cell_delay_ns":{"type":"integer","format":"int64","minimum":2100,"default":5000,"description":"Delay between two storage cells [ns]"},"jungfrau_fixed_gain_g1":{"type":"boolean","default":false,"description":"Fix gain to G1 (can be useful for storage cells)"},"jungfrau_use_gain_hg0":{"type":"boolean","default":false,"description":"Use high G0 (for low energy applications)"}}},"spot_finding_settings":{"type":"object","required":["enable","indexing","signal_to_noise_threshold","photon_count_threshold","max_pix_per_spot","min_pix_per_spot","low_resolution_limit","quick_integration","high_resolution_limit_for_spot_count_low_res","ice_ring_width_q_recipA"],"properties":{"enable":{"type":"boolean","default":true,"description":"Enable spot finding. This is temporary setting, i.e. can be changed anytime during data collection. \nEven if disabled spot finding information will still be send and written, though always with zero spots.\n"},"indexing":{"type":"boolean","default":true,"description":"Enable indexing. This is temporary setting, i.e. can be changed anytime during data collection.\n"},"signal_to_noise_threshold":{"type":"number","format":"float","minimum":0},"photon_count_threshold":{"type":"integer","format":"int64","minimum":0},"min_pix_per_spot":{"type":"integer","format":"int64","minimum":1},"max_pix_per_spot":{"type":"integer","format":"int64","minimum":1},"high_resolution_limit":{"type":"number","format":"float","description":"High resolution limit for spot finding [Angstrom]. Optional: if omitted, spot finding extends\nas far as the detector reaches, i.e. the detection is not clipped in resolution.\n"},"low_resolution_limit":{"type":"number","format":"float","description":"Low resolution limit for spot finding [Angstrom]"},"high_resolution_limit_for_spot_count_low_res":{"type":"number","format":"float","description":"High resolution threshold to consider spot \"low resolution\" [Angstrom]","minimum":2,"maximum":8},"quick_integration":{"type":"boolean","default":false,"description":"Quick integration of Bragg spots in diffraction images.\nIf enabled it will likely reduce performance of Jungfraujoch for datasets with a very high indexing rate.\n(experimental feature)\n"},"ice_ring_width_q_recipA":{"type":"number","format":"float","minimum":0,"maximum":1,"default":0.03,"description":"Half-width of the ice ring band in q (1/A). 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One entry per module\nOne entry per module. Either empty or number of module entries.\n","items":{"type":"string"}},"sensor_material":{"type":"string","default":"Si"},"tx_delay":{"type":"array","items":{"type":"integer","format":"int64"}},"base_data_ipv4_address":{"type":"string","example":"10.10.10.50"},"standard_geometry":{"$ref":"#/components/schemas/standard_detector_geometry"},"custom_geometry":{"type":"array","items":{"$ref":"#/components/schemas/detector_module"}},"roi_mode":{"type":"string","default":"","description":"ROI setting for DECTRIS detectors"},"mirror_y":{"type":"boolean","default":true,"description":"Mirror detector in Y direction to account for MX convention of (0,0) point in top left corner"},"temp_thresold_degC":{"type":"integer","format":"int64","description":"Temperature threshold for JUNGFRAU detector modules","minimum":40,"maximum":70,"default":55},"default_settings":{"$ref":"#/components/schemas/detector_settings"}}},"zeromq_settings":{"type":"object","description":"ZeroMQ configuration for Jungfraujoch software.\nThis structure is used to provide default settings using configuration JSON file and is not used in HTTP.\n","properties":{"send_watermark":{"type":"integer","format":"int64","minimum":2,"maximum":16384,"default":100,"description":"Watermark for ZeroMQ send queue (number of outstanding messages queued on Jungfraujoch server per queue)"},"send_buffer_size":{"type":"integer","format":"int64","description":"Send buffer size for ZeroMQ socket"},"image_socket":{"type":"array","items":{"type":"string"},"example":["tcp://1.2.3.4:5000","tcp://1.2.3.4:5001"],"description":"PUSH ZeroMQ socket for images. In case multiple sockets are provided, images are streamed over multiple sockets.  \nImages are serialized using CBOR.\nAddress follows ZeroMQ convention for sockets - in practice ipc://<socket file> and tpc://<IP address>:<port> sockets are OK.\n0.0.0.0 instead of IP address is accepted and means listening on all network interfaces.\n"},"writer_notification_socket":{"type":"string","example":"tcp://1.3.4.6:7000","description":"PULL ZeroMQ socket for notifications from writer that it finished operation. \nThis allows Jungfraujoch to operate in a synchronous manner, with end of acquisition being also end of writing.\nAddress follows ZeroMQ convention for sockets - in practice ipc://<socket file> and tpc://<IP address>:<port> sockets are OK.\n0.0.0.0 instead of IP address should be avoided, as this socket address is forwarded to the writer process via START ZerOMQ message and in case of multiple ineterfaces the address might be ambigous.\nUsing * (star) instead of port number is allowed and it means a random free port number.\n"}}},"tcp_settings":{"type":"object","description":"TCP image stream configuration for Jungfraujoch software.\nThis structure is used to provide default settings using configuration JSON file and is not used in HTTP.\n","required":["addr"],"properties":{"send_buffer_size":{"type":"integer","format":"int64","description":"Send buffer size for TCP/IP socket"},"image_socket":{"type":"string","example":"tcp://1.2.3.4:5000","description":"tcp://<IP address>:<port>\n0.0.0.0 instead of IP address is accepted and means listening on all network interfaces\n"},"nwriters":{"type":"integer","format":"int64","minimum":1,"maximum":100,"default":32,"description":"Number of TCP/IP writers to be used for streaming images"},"peer_liveness_timeout_ms":{"type":"integer","format":"int64","description":"Max time (in milliseconds) a send may block with no sign of life from the\nwriter (no BUSY heartbeat or ACK) before the connection is declared dead.\nOptional; the built-in default is used when unset.\n"},"max_backpressure_timeout_ms":{"type":"integer","format":"int64","description":"Hard upper bound (in milliseconds) on backpressure: if no bytes can be sent to\nthe writer for this long the connection is declared dead even while the writer\nkeeps heartbeating, so a wedged writer cannot block the run or its\nfinalization. Optional; the built-in default is used when unset.\n"}}},"pcie_devices":{"type":"array","minLength":1,"items":{"type":"object","required":["block_device"],"properties":{"blk":{"type":"string","example":"/dev/jfjoch0","description":"Block device name"},"ipv4":{"type":"string","example":"10.1.1.7","description":"IPv4 address of the block device"}}}},"bragg_integration_settings":{"type":"object","description":"Settings for Bragg spot integration","required":["integration_model"],"properties":{"integration_model":{"$ref":"#/components/schemas/integration_model"},"max_hkl":{"type":"integer","minimum":1,"maximum":511,"default":100,"description":"How far the Bragg predictor walks the lattice: reflections with |h|,|k|,|l| above this are\nnever predicted. An axis is truncated once a/d_min exceeds it, so a long axis - or a short\none taken to high resolution - loses its outermost reflections. The cost grows as the cube\n(2n+1)^3 of candidates per image, which is why online keeps a fixed, predictable value\ninstead of taking it from whichever crystal is mounted.\n\nOmitting the field selects the default above; it is never interpreted as \"choose per\ncrystal\". The offline tools (rugnux, viewer) do derive it from the refined cell when it is\nleft unset there, but that is their own default and is not reachable through this API.\n"}}},"jfjoch_settings":{"type":"object","required":["detector","frontend_directory","image_pusher"],"description":"Default settings for Jungfraujoch software. \nThis structure is used to provide default settings using configuration JSON file and is not used in HTTP.\n","properties":{"pcie":{"$ref":"#/components/schemas/pcie_devices"},"zeromq":{"$ref":"#/components/schemas/zeromq_settings"},"tcp":{"$ref":"#/components/schemas/tcp_settings"},"instrument":{"$ref":"#/components/schemas/instrument_metadata"},"file_writer":{"$ref":"#/components/schemas/file_writer_settings"},"detector":{"type":"array","minLength":1,"items":{"$ref":"#/components/schemas/detector"}},"indexing":{"$ref":"#/components/schemas/indexing_settings"},"bragg_integration":{"$ref":"#/components/schemas/bragg_integration_settings"},"detector_settings":{"$ref":"#/components/schemas/detector_settings"},"azim_int":{"$ref":"#/components/schemas/azim_int_settings"},"image_format":{"$ref":"#/components/schemas/image_format_settings"},"image_buffer_MiB":{"type":"integer","minimum":128,"default":2048,"description":"Size of internal buffer in MiB for images before they are sent to a stream"},"verbose":{"type":"boolean","default":false,"description":"Print extra debug information"},"receiver_threads":{"type":"integer","minimum":1,"maximum":512,"default":64,"description":"Number of threads used by the receiver"},"numa_policy":{"type":"string","deprecated":true,"description":"Ignored value"},"frontend_directory":{"type":"string","description":"Location of built JavaScript web frontend"},"spot_finding":{"$ref":"#/components/schemas/spot_finding_settings"},"image_pusher":{"$ref":"#/components/schemas/image_pusher_type"},"zeromq_preview":{"$ref":"#/components/schemas/zeromq_preview_settings"},"zeromq_metadata":{"$ref":"#/components/schemas/zeromq_metadata_settings"},"dark_mask":{"$ref":"#/components/schemas/dark_mask_settings"}}},"zeromq_metadata_settings":{"type":"object","required":["enabled","period_ms"],"properties":{"enabled":{"type":"boolean","default":true,"description":"ZeroMQ metadata socket is enabled."},"period_ms":{"type":"integer","format":"int64","minimum":1,"default":1000,"description":"Period for generating metadata package sent to the ZeroMQ interface in milliseconds.\n"},"socket_address":{"type":"string","description":"PUB ZeroMQ socket for image metadata information.\nImage metadata are serialized using CBOR.\nAddress follows ZeroMQ convention for sockets - in practice ipc://<socket file> and tcp://<IP address>:<port> sockets are OK.\n0.0.0.0 instead of IP address is accepted and means listening on all network interfaces.\n"}}},"zeromq_preview_settings":{"type":"object","required":["enabled","period_ms"],"properties":{"enabled":{"type":"boolean","default":true,"description":"ZeroMQ preview socket is enabled."},"period_ms":{"type":"integer","format":"int64","default":1000,"description":"Period for generating preview image sent to the ZeroMQ interface in milliseconds. Default is 1 second. \nIf set to zero, all images will be sent ZeroMQ (should be used only in case of relatively slow data collection).\nThis has no effect on HTTP based preview, which updates always at rate of 1 second.\n"},"socket_address":{"type":"string","description":"PUB ZeroMQ socket for preview images. This socket operates at a reduced frame rate.\nImages are serialized using CBOR.\nAddress follows ZeroMQ convention for sockets - in practice ipc://<socket file> and tcp://<IP address>:<port> sockets are OK.\n0.0.0.0 instead of IP address is accepted and means listening on all network interfaces.\n"}}}}},"paths":{"/initialize":{"post":{"summary":"Initialize detector and data acquisition","description":"Should be used in two cases:\n  - Detector is in `Inactive` state\n  - Detector is in `Error` state\nX-ray shutter must be closed. \nThis operation will reconfigure network interface of the detector. \nDuring operation of the detector it is recommended to use the `POST /pedestal` operation instead.\nIf storage cells are used, the execution time might be few minutes.\n\nThis is async function - one needs to use `POST /wait_till_done` to ensure operation is done.\n","responses":{"200":{"description":"Initialization started"},"500":{"description":"Error within Jungfraujoch code - see output message.","content":{"application/json":{"schema":{"$ref":"#/components/schemas/error_message"}}}}}}},"/pedestal":{"post":{"summary":"Collect dark current for the detector","description":"Updates calibration of the JUNGFRAU detector. Must be in `Idle` state.\n\nX-ray shutter must be closed. Recommended to run once per hour for long integration times (> 100 us).\n\nThis is async function - one needs to use `POST /wait_till_done` to ensure operation is done.\n","responses":{"200":{"description":"Everything OK"},"500":{"description":"Error within Jungfraujoch code - see output message.","content":{"application/json":{"schema":{"$ref":"#/components/schemas/error_message"}}}}}}},"/start":{"post":{"summary":"Start detector","description":"Start data acquisition.\nDetector must be in `Idle` state.\nDefault behavior is for the call to block until detector is ready to accept soft/TTL triggers.\nHowever, this behavior can be changed by settings `async_start` to true in the request body, \nin which case the call will return immediately and one needs to use `/wait_until_running` to ensure detector is ready to run.\n","requestBody":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/dataset_settings"}}}},"responses":{"200":{"description":"Everything OK"},"400":{"description":"Input parsing or validation error","content":{"text/plain":{"schema":{"type":"string","description":"Exception error"}}}},"500":{"description":"Error within Jungfraujoch code - see output message.","content":{"application/json":{"schema":{"$ref":"#/components/schemas/error_message"}}}}}}},"/wait_until_running":{"post":{"summary":"Wait for acquisition running","parameters":[{"in":"query","name":"timeout","required":false,"schema":{"type":"integer","default":60,"minimum":0,"maximum":3600},"description":"Timeout in seconds (0 == immediate response)"}],"description":"Block execution of external script till detector and Jungfraujoch are ready to collect data.\nTo not block web server for a indefinite period of time, the procedure is provided with a timeout.\nExtending timeout is possible, but requires to ensure safety that client will not close the connection and retry the connection.\n","responses":{"200":{"description":"Detector in `Measuring` state"},"400":{"description":"Timeout parameter out of bounds"},"500":{"description":"Error within Jungfraujoch code - see output message.","content":{"application/json":{"schema":{"$ref":"#/components/schemas/error_message"}}}},"502":{"description":"Detector is inactive mode"},"504":{"description":"Timeout reached, need to restart operation"}}}},"/wait_till_done":{"post":{"summary":"Wait for acquisition done","parameters":[{"in":"query","name":"timeout","required":false,"schema":{"type":"integer","default":60,"minimum":0,"maximum":3600},"description":"Timeout in seconds (0 == immediate response)"}],"description":"Block execution of external script till initialization, data collection or pedestal is finished.\nRunning this command does not affect (cancel) running data collection, it is only to ensure synchronous execution of other software.\n\nTo not block web server for a indefinite period of time, the procedure is provided with a timeout.\nExtending timeout is possible, but requires to ensure safety that client will not close the connection and retry the connection.\n","responses":{"200":{"description":"Detector in `Idle` state, another data collection can start immediately"},"400":{"description":"Timeout parameter out of bounds"},"500":{"description":"Error within Jungfraujoch code - see output message.","content":{"application/json":{"schema":{"$ref":"#/components/schemas/error_message"}}}},"502":{"description":"Detector is inactive mode"},"504":{"description":"Timeout reached, need to restart operation"}}}},"/trigger":{"post":{"summary":"Send soft trigger to the detector","description":"Generate soft trigger","responses":{"200":{"description":"Trigger sent"}}}},"/cancel":{"post":{"summary":"Cancel running data collection","description":"Command will inform FPGA network card to stop pedestal or data collection at the current stage.\nAny frame that is currently being processed by CPU will be finished and sent to writer.\nGiven the command is making sure to gracefully stop data acquisition and detector, it might take some time to switch back after command finished to `Idle` state.\n\nIf data collection is not running, the command has no effect.\n","responses":{"200":{"description":"Cancel request sent to FPGAs (or ignored, as data collection is not running)"}}}},"/deactivate":{"post":{"summary":"Prepare detector to turn off","description":"Should be in `Idle` or `Error` state.\nCommand deactivates data acquisition and turns off detector high voltage and ASIC.\nShould be used always before turning off power from the detector.\n","responses":{"200":{"description":"Detector ready to turn off"},"500":{"description":"Error within Jungfraujoch code - see output message.","content":{"application/json":{"schema":{"$ref":"#/components/schemas/error_message"}}}}}}},"/config/detector":{"put":{"summary":"Change detector configuration","description":"Detector settings are ones that have effect on calibration, i.e., pedestal has to be collected again after changing these settings.\nThis can only be done when detector is `Idle`, `Error` or `Inactive` states.\nIf detector is in `Idle` state , pedestal procedure will be executed automatically - there must be no X-rays on the detector during the operation.\nIf detector is in `Inactive` or `Error` states, new settings will be saved, but no calibration will be executed.\n","requestBody":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/detector_settings"}}}},"responses":{"200":{"description":"Everything OK"},"400":{"description":"Input parsing or validation error","content":{"text/plain":{"schema":{"type":"string","description":"Exception error"}}}},"500":{"description":"Error within Jungfraujoch code - see output message.","content":{"application/json":{"schema":{"$ref":"#/components/schemas/error_message"}}}}}},"get":{"summary":"Get detector configuration","description":"Can be done anytime","responses":{"200":{"description":"Everything OK","content":{"application/json":{"schema":{"$ref":"#/components/schemas/detector_settings"}}}}}}},"/config/indexing":{"put":{"summary":"Change indexing algorithm settings","description":"This can only be done when detector is `Idle`, `Error` or `Inactive` states.\n","requestBody":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/indexing_settings"}}}},"responses":{"200":{"description":"Everything OK"},"400":{"description":"Input parsing or validation error","content":{"text/plain":{"schema":{"type":"string","description":"Exception error"}}}},"500":{"description":"Error within Jungfraujoch code - see output message.","content":{"application/json":{"schema":{"$ref":"#/components/schemas/error_message"}}}}}},"get":{"summary":"Get indexing configuration","description":"Can be done anytime","responses":{"200":{"description":"Everything OK","content":{"application/json":{"schema":{"$ref":"#/components/schemas/indexing_settings"}}}}}}},"/config/bragg_integration":{"put":{"summary":"Change Bragg integration settings","description":"This can only be done when detector is `Idle`, `Error` or `Inactive` states.\n","requestBody":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/bragg_integration_settings"}}}},"responses":{"200":{"description":"Everything OK"},"400":{"description":"Input parsing or validation error","content":{"text/plain":{"schema":{"type":"string","description":"Exception error"}}}},"500":{"description":"Error within Jungfraujoch code - see output message.","content":{"application/json":{"schema":{"$ref":"#/components/schemas/error_message"}}}}}},"get":{"summary":"Get Bragg integration configuration","description":"Can be done anytime","responses":{"200":{"description":"Everything OK","content":{"application/json":{"schema":{"$ref":"#/components/schemas/bragg_integration_settings"}}}}}}},"/config/file_writer":{"put":{"summary":"Change file writer settings","description":"This can only be done when detector is `Idle`, `Error` or `Inactive` states.\n","requestBody":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/file_writer_settings"}}}},"responses":{"200":{"description":"Everything OK"},"400":{"description":"Input parsing or validation error","content":{"text/plain":{"schema":{"type":"string","description":"Exception error"}}}},"500":{"description":"Error within Jungfraujoch code - see output message.","content":{"application/json":{"schema":{"$ref":"#/components/schemas/error_message"}}}}}},"get":{"summary":"Get file writer settings","description":"Can be done anytime","responses":{"200":{"description":"Everything OK","content":{"application/json":{"schema":{"$ref":"#/components/schemas/file_writer_settings"}}}}}}},"/config/instrument":{"put":{"summary":"Change instrument metadata","description":"This can only be done when detector is `Idle`, `Error` or `Inactive` states.\n","requestBody":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/instrument_metadata"}}}},"responses":{"200":{"description":"Everything OK"},"400":{"description":"Input parsing or validation error","content":{"text/plain":{"schema":{"type":"string","description":"Exception error"}}}},"500":{"description":"Error within Jungfraujoch code - see output message.","content":{"application/json":{"schema":{"$ref":"#/components/schemas/error_message"}}}}}},"get":{"summary":"Get instrument metadata","description":"Can be done anytime","responses":{"200":{"description":"Everything OK","content":{"application/json":{"schema":{"$ref":"#/components/schemas/instrument_metadata"}}}}}}},"/config/image_format":{"put":{"summary":"Change image output format","description":"This can only be done when detector is `Idle`, `Error` or `Inactive` states.\n","requestBody":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/image_format_settings"}}}},"responses":{"200":{"description":"Everything OK"},"400":{"description":"Input parsing or validation error","content":{"text/plain":{"schema":{"type":"string","description":"Exception error"}}}},"500":{"description":"Error within Jungfraujoch code - see output message.","content":{"application/json":{"schema":{"$ref":"#/components/schemas/error_message"}}}}}},"get":{"summary":"Get image output format","description":"Can be done anytime","responses":{"200":{"description":"Everything OK","content":{"application/json":{"schema":{"$ref":"#/components/schemas/image_format_settings"}}}}}}},"/config/image_format/raw":{"post":{"summary":"Configure format for raw data collection","description":"This can only be done when detector is `Idle`, `Error` or `Inactive` states.\n","responses":{"200":{"description":"Everything OK"},"500":{"description":"Error within Jungfraujoch code - see output message.","content":{"application/json":{"schema":{"$ref":"#/components/schemas/error_message"}}}}}}},"/config/image_format/conversion":{"post":{"summary":"Configure format for data collection with full conversion","description":"This can only be done when detector is `Idle`, `Error` or `Inactive` states.\n","responses":{"200":{"description":"Everything OK"},"500":{"description":"Error within Jungfraujoch code - see output message.","content":{"application/json":{"schema":{"$ref":"#/components/schemas/error_message"}}}}}}},"/config/spot_finding":{"put":{"summary":"Configure spot finding","description":"Can be done anytime, also while data collection is running","requestBody":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/spot_finding_settings"}}}},"responses":{"200":{"description":"Everything OK"},"400":{"description":"Input parsing or validation error","content":{"text/plain":{"schema":{"type":"string","description":"Exception error"}}}}}},"get":{"summary":"Get data processing configuration","description":"Can be done anytime","responses":{"200":{"description":"Everything OK","content":{"application/json":{"schema":{"$ref":"#/components/schemas/spot_finding_settings"}}}}}}},"/config/azim_int":{"put":{"summary":"Configure azimuthal integration","description":"Can be done when detector is Inactive or Idle","requestBody":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/azim_int_settings"}}}},"responses":{"200":{"description":"Everything OK"},"400":{"description":"Input parsing or validation error","content":{"text/plain":{"schema":{"type":"string","description":"Exception error"}}}},"500":{"description":"Error within Jungfraujoch code - see output message.","content":{"application/json":{"schema":{"$ref":"#/components/schemas/error_message"}}}}}},"get":{"summary":"Get azimuthal integration configuration","description":"Can be done anytime","responses":{"200":{"description":"Everything OK","content":{"application/json":{"schema":{"$ref":"#/components/schemas/azim_int_settings"}}}}}}},"/config/internal_generator_image":{"put":{"summary":"Load binary image for internal FPGA generator","description":"Load image for internal FPGA generator. This can only happen in Idle state of the detector.\nRequires binary blob with 16-bit integer numbers of size of detector in raw/converted coordinates \n(depending on detector settings).\n","parameters":[{"name":"id","in":"query","description":"Image id to upload","required":false,"schema":{"type":"integer","format":"int64","minimum":0,"maximum":127}}],"requestBody":{"content":{"application/octet-stream":{"schema":{"type":"string","format":"binary"}}}},"responses":{"200":{"description":"Everything OK"},"400":{"description":"Input parsing or validation error","content":{"text/plain":{"schema":{"type":"string","description":"Exception error"}}}}}}},"/config/internal_generator_image.tiff":{"put":{"summary":"Load TIFF image for internal FPGA generator","description":"Load image for internal FPGA generator. This can only happen in Idle state of the detector.\nRequires TIFF with 16-bit integer numbers of size of detector in raw/converted coordinates \n(depending on detector settings).\n","parameters":[{"in":"query","name":"id","description":"Image ID to upload","required":false,"schema":{"type":"integer","minimum":0,"maximum":127}}],"requestBody":{"content":{"image/tiff":{"schema":{"type":"string","format":"binary"}}}},"responses":{"200":{"description":"Everything OK"},"400":{"description":"Input parsing or validation error","content":{"text/plain":{"schema":{"type":"string","description":"Exception error"}}}}}}},"/config/select_detector":{"put":{"summary":"Select detector","description":"Jungfraujoch allows to control multiple detectors and/or region-of-interests.\nThe command allows to choose one detector from the list (ID has to be consistent with one provided by GET response).\nChanging detector will set detector to `Inactive` state and will require reinitialization.\n","requestBody":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/detector_selection"}}}},"responses":{"200":{"description":"Everything OK"},"400":{"description":"Input parsing or validation error","content":{"text/plain":{"schema":{"type":"string","description":"Exception error"}}}},"500":{"description":"Error within Jungfraujoch code - see output message.","content":{"application/json":{"schema":{"$ref":"#/components/schemas/error_message"}}}}}},"get":{"summary":"List available detectors","description":"Configured detectors that can be selected by used","responses":{"200":{"description":"Everything OK","content":{"application/json":{"schema":{"$ref":"#/components/schemas/detector_list"}}}}}}},"/config/zeromq_preview":{"put":{"summary":"Set ZeroMQ preview settings","description":"Jungfraujoch can generate preview message stream on ZeroMQ SUB socket.\nHere settings of the socket can be adjusted.\nWhile the data structure contains also socket_address, this cannot be changed via HTTP and is ignore in PUT request.\nOptions set with this PUT request have no effect on HTTP based preview.\n","requestBody":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/zeromq_preview_settings"}}}},"responses":{"200":{"description":"Everything OK"},"400":{"description":"Input parsing or validation error","content":{"text/plain":{"schema":{"type":"string","description":"Exception error"}}}},"500":{"description":"Error within Jungfraujoch code - see output message.","content":{"application/json":{"schema":{"$ref":"#/components/schemas/error_message"}}}}}},"get":{"summary":"Get ZeroMQ preview settings","responses":{"200":{"description":"Everything OK","content":{"application/json":{"schema":{"$ref":"#/components/schemas/zeromq_preview_settings"}}}}}}},"/config/zeromq_metadata":{"put":{"summary":"Set ZeroMQ metadata settings","description":"Jungfraujoch can generate metadata message stream on ZeroMQ PUB socket. This stream covers all images.\nHere settings of the socket can be adjusted.\nWhile the data structure contains also socket_address, this cannot be changed via HTTP and is ignore in PUT request.\n","requestBody":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/zeromq_metadata_settings"}}}},"responses":{"200":{"description":"Everything OK"},"400":{"description":"Input parsing or validation error","content":{"text/plain":{"schema":{"type":"string","description":"Exception error"}}}},"500":{"description":"Error within Jungfraujoch code - see output message.","content":{"application/json":{"schema":{"$ref":"#/components/schemas/error_message"}}}}}},"get":{"summary":"Get ZeroMQ metadata socket settings","responses":{"200":{"description":"Everything OK","content":{"application/json":{"schema":{"$ref":"#/components/schemas/zeromq_metadata_settings"}}}}}}},"/config/dark_mask":{"put":{"summary":"Set configuration for dark data collection to calculate mask","description":"This is only possible when operating DECTRIS detectors at the moment; it will be also available for PSI EIGER at some point.\nThis can only be done when detector is `Idle`, `Error` or `Inactive` states.\n","requestBody":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/dark_mask_settings"}}}},"responses":{"200":{"description":"Everything OK"},"400":{"description":"Input parsing or validation error","content":{"text/plain":{"schema":{"type":"string","description":"Exception error"}}}},"500":{"description":"Error within Jungfraujoch code - see output message.","content":{"application/json":{"schema":{"$ref":"#/components/schemas/error_message"}}}}}},"get":{"summary":"Get settings for dark data collection to calculate mask","responses":{"200":{"description":"Everything OK","content":{"application/json":{"schema":{"$ref":"#/components/schemas/dark_mask_settings"}}}}}}},"/status":{"get":{"summary":"Get Jungfraujoch status","description":"Status of the data acquisition","responses":{"200":{"description":"Everything OK","content":{"application/json":{"schema":{"$ref":"#/components/schemas/broker_status"}}}}}}},"/fpga_status":{"get":{"summary":"Get status of FPGA devices","responses":{"200":{"description":"Everything OK","content":{"application/json":{"schema":{"$ref":"#/components/schemas/fpga_status"}}}}}}},"/xfel/pulse_id":{"get":{"summary":"Return XFEL pulse IDs for the current data acquisition","description":"Return array of XFEL pulse IDs - (-1) if image not recorded","responses":{"200":{"description":"Pulse ID collected","content":{"application/json":{"schema":{"type":"array","items":{"type":"integer","format":"int64"}}}}},"404":{"description":"Not in XFEL mode or no acquisition recorded"}}}},"/xfel/event_code":{"get":{"summary":"Return XFEL event codes for the current data acquisition","description":"Return array of XFEL event codes","responses":{"200":{"description":"Event codes collected","content":{"application/json":{"schema":{"type":"array","items":{"type":"integer","format":"int64"}}}}},"404":{"description":"Not in XFEL mode or no acquisition recorded"}}}},"/image_pusher/status":{"get":{"summary":"Get status of image pusher","responses":{"200":{"description":"Everything OK","content":{"application/json":{"schema":{"$ref":"#/components/schemas/image_pusher_status"}}}},"500":{"description":"Error encountered when trying to read status","content":{"text/plain":{"schema":{"type":"string","description":"Exception error"}}}}}}},"/detector/status":{"get":{"summary":"Get detector status","description":"Status of the JUNGFRAU detector","responses":{"200":{"description":"Everything OK","content":{"application/json":{"schema":{"$ref":"#/components/schemas/detector_status"}}}},"404":{"description":"Running in \"simulator\" mode - no detector present"},"500":{"description":"Error encountered when trying to read status","content":{"text/plain":{"schema":{"type":"string","description":"Exception error"}}}}}}},"/config/roi":{"get":{"summary":"Get ROI definitions","responses":{"200":{"description":"OK","content":{"application/json":{"schema":{"$ref":"#/components/schemas/roi_definitions"}}}}}},"put":{"summary":"Upload ROI definitions","requestBody":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/roi_definitions"}}}},"responses":{"200":{"description":"Everything OK"},"400":{"description":"Input parsing or validation error","content":{"text/plain":{"schema":{"type":"string","description":"Exception error"}}}},"500":{"description":"Error within Jungfraujoch code - see output message.","content":{"application/json":{"schema":{"$ref":"#/components/schemas/error_message"}}}}}}},"/statistics":{"get":{"summary":"Get general statistics","responses":{"200":{"description":"Everything OK","content":{"application/json":{"schema":{"$ref":"#/components/schemas/jfjoch_statistics"}}}}}}},"/statistics/data_collection":{"get":{"summary":"Get data collection statistics","description":"Results of the last data collection","responses":{"200":{"description":"Everything OK","content":{"application/json":{"schema":{"$ref":"#/components/schemas/measurement_statistics"}}}},"404":{"description":"No data collection performed so far"}}}},"/statistics/calibration":{"get":{"summary":"Get calibration statistics","description":"Statistics are provided for each module/storage cell separately","responses":{"200":{"description":"Everything OK","content":{"application/json":{"schema":{"$ref":"#/components/schemas/calibration_statistics"}}}}}}},"/config/mask":{"get":{"summary":"Get mask of the detector (binary)","description":"Detector must be Initialized.\nGet full pixel mask of the detector.\nSee NXmx standard for meaning of pixel values.\n","responses":{"200":{"description":"Binary array (4 byte; unsigned)","content":{"application/octet-stream":{"schema":{"type":"string","format":"binary"}}}}}}},"/config/user_mask":{"get":{"summary":"Detector must be Initialized.\nGet user mask of the detector (binary)\n","description":"Get user pixel mask of the detector in the actual detector coordinates: 0 - good pixel, 1 - masked","responses":{"200":{"description":"User mask in binary format (4 byte; unsigned)","content":{"application/octet-stream":{"schema":{"type":"string","format":"binary"}}}}}},"put":{"summary":"Upload user mask of the detector (binary)","description":"Should be in `Idle` state.\nUpload user mask of the detector - this is for example to account for beam stop shadow or misbehaving regions.\nIf detector is conversion mode the mask can be both in raw (1024x512; stacked modules) or converted coordinates.\nIn the latter case - module gaps are ignored and don't need to be assigned value.\nMask is expected as binary array (4-byte; unsigned).\n0 - good pixel, other value - masked\nUser mask is stored in NXmx pixel mask (bit 8), as well as used in spot finding and azimuthal integration.\n","requestBody":{"content":{"application/octet-stream":{"schema":{"type":"string","format":"binary"}}}},"responses":{"200":{"description":"All good"},"400":{"description":"Mask is not 4-byte unsigned integer array or empty body"},"500":{"description":"Error within Jungfraujoch code - see output message.","content":{"application/json":{"schema":{"$ref":"#/components/schemas/error_message"}}}}}}},"/config/mask.tiff":{"get":{"summary":"Get mask of the detector (TIFF)","description":"Should be in `Idle` state.\nGet full pixel mask of the detector\nSee NXmx standard for meaning of pixel values\n","responses":{"200":{"description":"Pixel mask in TIFF format (4 byte; 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Lattices outside given tolerance will be ignored"},"viable_cell_min_spots":{"type":"integer","format":"int64","minimum":5,"default":10,"description":"Minimum number of indexed spots required for a cell to be considered viable"},"index_ice_rings":{"type":"boolean","default":false,"description":"Include spots marked as ice rings in the indexing run. \nIf `dataset_settings` doesn't have `detect_ice_rings` on, this option will have no effect on processing.\n"},"rotation_indexing":{"type":"boolean","default":false},"rotation_indexing_min_angular_range_deg":{"type":"number","format":"float","default":20,"minimum":1},"rotation_indexing_angular_stride_deg":{"type":"number","format":"float","default":0.5,"minimum":0},"blocking":{"type":"boolean","default":true,"description":"Indexing in Jungfraujoch goes with a dedicated thread pool.\nIf set to false, the thread pool is non-blocking, i.e. if there are no threads available, image indexing will be skipped. This option is recommended for real-time processing at high frame rates.\nIf set to true, the thread pool will block until a thread is available.\n"}}},"instrument_metadata":{"type":"object","description":"Metadata for a measurement instrument","required":["source_name","instrument_name"],"properties":{"source_name":{"type":"string","example":"Swiss Light Source"},"source_type":{"type":"string","description":"Type of radiation source. NXmx gives a fixed dictionary, though Jungfraujoch is not enforcing compliance. \nhttps://manual.nexusformat.org/classes/base_classes/NXsource.html#nxsource\nNXsource allows the following:\n\nSpallation Neutron Source\nPulsed Reactor Neutron Source\nReactor Neutron Source\nSynchrotron X-ray Source\nPulsed Muon Source\nRotating Anode X-ray\nFixed Tube X-ray\nUV Laser\nFree-Electron Laser\nOptical Laser\nIon Source\nUV Plasma Source\nMetal Jet X-ray\n","example":"Synchrotron X-ray Source","default":""},"instrument_name":{"type":"string","example":"CristallinaMX"},"pulsed_source":{"type":"boolean","description":"Settings specific to XFEL (e.g., every image has to come from TTL trigger, save pulse ID and event code)\n","default":false},"electron_source":{"type":"boolean","description":"Settings specific to electron source (e.g., wavelength definition)\n","default":false}}},"detector_module_direction":{"type":"string","enum":["Xp","Xn","Yp","Yn"]},"detector_type":{"type":"string","enum":["EIGER","JUNGFRAU","DECTRIS"]},"image_pusher_type":{"type":"string","default":"None","enum":["ZeroMQ","HDF5","CBOR","TCP","None"]},"standard_detector_geometry":{"type":"object","description":"Regular rectangular geometry, first module is in the bottom left corner of the detector","required":["nmodules"],"properties":{"nmodules":{"type":"integer","minimum":1,"description":"Number of modules in the detector"},"gap_x":{"type":"integer","default":8,"minimum":0,"description":"Gap size in X direction [pixels]"},"gap_y":{"type":"integer","minimum":0,"default":36,"description":"Gap size in Y direction [pixels]"},"modules_in_row":{"type":"integer","minimum":1,"default":1,"description":"Number of modules in one row"}}},"detector_module":{"type":"object","required":["x0","y0","fast_axis","slow_axis"],"properties":{"x0":{"type":"number"},"y0":{"type":"number"},"fast_axis":{"$ref":"#/components/schemas/detector_module_direction"},"slow_axis":{"$ref":"#/components/schemas/detector_module_direction"}}},"detector":{"type":"object","required":["description"],"properties":{"description":{"type":"string","minLength":1},"serial_number":{"type":"string","default":"Unknown","minLength":1},"type":{"$ref":"#/components/schemas/detector_type"},"high_voltage_V":{"type":"integer","format":"int64","minimum":0,"maximum":200,"default":0},"udp_interface_count":{"type":"integer","format":"int64","minimum":1,"maximum":2,"default":1},"module_sync":{"type":"boolean","default":true,"description":"Use module 0 as master for timing. Only applies to JUNGFRAU detector (this cannot be turned off for EIGER)."},"sensor_thickness_um":{"type":"number","format":"float","minimum":0,"default":320},"readout_time_ns":{"type":"integer","format":"int64","minimum":1,"description":"Minimum difference between frame time and count time in microseconds\nDefaults are 3'000 ns for EIGER and 20'000 ns for JUNGFRAU\n"},"min_count_time_ns":{"type":"integer","format":"int64","minimum":0,"description":"Minimum count time available for the detector."},"min_frame_time_ns":{"type":"integer","format":"int64","minimum":0,"description":"Minimum frame time available for the detector."},"calibration_file":{"type":"array","description":"Can be empty for all detectors - default calibration used.\nFor JUNGFRAU: list of gain files, one entry per module.\nFor EIGER: one directory (with detector settings) or list of trim bit files, one entry per half-module.\n","items":{"type":"string"}},"trim_energies_eV":{"type":"array","description":"List of energies at which trimming calibration is provided.\nOnly needed for PSI EIGER and compulsory in this case\n","items":{"type":"integer","format":"int32","minimum":100}},"hostname":{"type":"array","description":"Hostname for detector module. One entry per module\nOne entry per module. Either empty or number of module entries.\n","items":{"type":"string"}},"sensor_material":{"type":"string","default":"Si"},"tx_delay":{"type":"array","items":{"type":"integer","format":"int64"}},"base_data_ipv4_address":{"type":"string","example":"10.10.10.50"},"standard_geometry":{"$ref":"#/components/schemas/standard_detector_geometry"},"custom_geometry":{"type":"array","items":{"$ref":"#/components/schemas/detector_module"}},"roi_mode":{"type":"string","default":"","description":"ROI setting for DECTRIS detectors"},"mirror_y":{"type":"boolean","default":true,"description":"Mirror detector in Y direction to account for MX convention of (0,0) point in top left corner"},"temp_thresold_degC":{"type":"integer","format":"int64","description":"Temperature threshold for JUNGFRAU detector modules","minimum":40,"maximum":70,"default":55},"default_settings":{"$ref":"#/components/schemas/detector_settings"}}},"zeromq_settings":{"type":"object","description":"ZeroMQ configuration for Jungfraujoch software.\nThis structure is used to provide default settings using configuration JSON file and is not used in HTTP.\n","properties":{"send_watermark":{"type":"integer","format":"int64","minimum":2,"maximum":16384,"default":100,"description":"Watermark for ZeroMQ send queue (number of outstanding messages queued on Jungfraujoch server per queue)"},"send_buffer_size":{"type":"integer","format":"int64","description":"Send buffer size for ZeroMQ socket"},"image_socket":{"type":"array","items":{"type":"string"},"example":["tcp://1.2.3.4:5000","tcp://1.2.3.4:5001"],"description":"PUSH ZeroMQ socket for images. In case multiple sockets are provided, images are streamed over multiple sockets.  \nImages are serialized using CBOR.\nAddress follows ZeroMQ convention for sockets - in practice ipc://<socket file> and tpc://<IP address>:<port> sockets are OK.\n0.0.0.0 instead of IP address is accepted and means listening on all network interfaces.\n"},"writer_notification_socket":{"type":"string","example":"tcp://1.3.4.6:7000","description":"PULL ZeroMQ socket for notifications from writer that it finished operation. \nThis allows Jungfraujoch to operate in a synchronous manner, with end of acquisition being also end of writing.\nAddress follows ZeroMQ convention for sockets - in practice ipc://<socket file> and tpc://<IP address>:<port> sockets are OK.\n0.0.0.0 instead of IP address should be avoided, as this socket address is forwarded to the writer process via START ZerOMQ message and in case of multiple ineterfaces the address might be ambigous.\nUsing * (star) instead of port number is allowed and it means a random free port number.\n"}}},"tcp_settings":{"type":"object","description":"TCP image stream configuration for Jungfraujoch software.\nThis structure is used to provide default settings using configuration JSON file and is not used in HTTP.\n","required":["addr"],"properties":{"send_buffer_size":{"type":"integer","format":"int64","description":"Send buffer size for TCP/IP socket"},"image_socket":{"type":"string","example":"tcp://1.2.3.4:5000","description":"tcp://<IP address>:<port>\n0.0.0.0 instead of IP address is accepted and means listening on all network interfaces\n"},"nwriters":{"type":"integer","format":"int64","minimum":1,"maximum":100,"default":32,"description":"Number of TCP/IP writers to be used for streaming images"},"peer_liveness_timeout_ms":{"type":"integer","format":"int64","description":"Max time (in milliseconds) a send may block with no sign of life from the\nwriter (no BUSY heartbeat or ACK) before the connection is declared dead.\nOptional; the built-in default is used when unset.\n"},"max_backpressure_timeout_ms":{"type":"integer","format":"int64","description":"Hard upper bound (in milliseconds) on backpressure: if no bytes can be sent to\nthe writer for this long the connection is declared dead even while the writer\nkeeps heartbeating, so a wedged writer cannot block the run or its\nfinalization. Optional; the built-in default is used when unset.\n"}}},"pcie_devices":{"type":"array","minLength":1,"items":{"type":"object","required":["block_device"],"properties":{"blk":{"type":"string","example":"/dev/jfjoch0","description":"Block device name"},"ipv4":{"type":"string","example":"10.1.1.7","description":"IPv4 address of the block device"}}}},"bragg_integration_settings":{"type":"object","description":"Settings for Bragg spot integration","required":["integration_model"],"properties":{"integration_model":{"$ref":"#/components/schemas/integration_model"},"max_hkl":{"type":"integer","minimum":1,"maximum":511,"default":100,"description":"How far the Bragg predictor walks the lattice: reflections with |h|,|k|,|l| above this are\nnever predicted. An axis is truncated once a/d_min exceeds it, so a long axis - or a short\none taken to high resolution - loses its outermost reflections. The cost grows as the cube\n(2n+1)^3 of candidates per image, which is why online keeps a fixed, predictable value\ninstead of taking it from whichever crystal is mounted.\n\nOmitting the field selects the default above; it is never interpreted as \"choose per\ncrystal\". The offline tools (rugnux, viewer) do derive it from the refined cell when it is\nleft unset there, but that is their own default and is not reachable through this API.\n"}}},"jfjoch_settings":{"type":"object","required":["detector","frontend_directory","image_pusher"],"description":"Default settings for Jungfraujoch software. \nThis structure is used to provide default settings using configuration JSON file and is not used in HTTP.\n","properties":{"pcie":{"$ref":"#/components/schemas/pcie_devices"},"zeromq":{"$ref":"#/components/schemas/zeromq_settings"},"tcp":{"$ref":"#/components/schemas/tcp_settings"},"instrument":{"$ref":"#/components/schemas/instrument_metadata"},"file_writer":{"$ref":"#/components/schemas/file_writer_settings"},"detector":{"type":"array","minLength":1,"items":{"$ref":"#/components/schemas/detector"}},"indexing":{"$ref":"#/components/schemas/indexing_settings"},"bragg_integration":{"$ref":"#/components/schemas/bragg_integration_settings"},"detector_settings":{"$ref":"#/components/schemas/detector_settings"},"azim_int":{"$ref":"#/components/schemas/azim_int_settings"},"image_format":{"$ref":"#/components/schemas/image_format_settings"},"image_buffer_MiB":{"type":"integer","minimum":128,"default":2048,"description":"Size of internal buffer in MiB for images before they are sent to a stream"},"verbose":{"type":"boolean","default":false,"description":"Print extra debug information"},"receiver_threads":{"type":"integer","minimum":1,"maximum":512,"default":64,"description":"Number of threads used by the receiver"},"numa_policy":{"type":"string","deprecated":true,"description":"Ignored value"},"frontend_directory":{"type":"string","description":"Location of built JavaScript web frontend"},"spot_finding":{"$ref":"#/components/schemas/spot_finding_settings"},"image_pusher":{"$ref":"#/components/schemas/image_pusher_type"},"zeromq_preview":{"$ref":"#/components/schemas/zeromq_preview_settings"},"zeromq_metadata":{"$ref":"#/components/schemas/zeromq_metadata_settings"},"dark_mask":{"$ref":"#/components/schemas/dark_mask_settings"}}},"zeromq_metadata_settings":{"type":"object","required":["enabled","period_ms"],"properties":{"enabled":{"type":"boolean","default":true,"description":"ZeroMQ metadata socket is enabled."},"period_ms":{"type":"integer","format":"int64","minimum":1,"default":1000,"description":"Period for generating metadata package sent to the ZeroMQ interface in milliseconds.\n"},"socket_address":{"type":"string","description":"PUB ZeroMQ socket for image metadata information.\nImage metadata are serialized using CBOR.\nAddress follows ZeroMQ convention for sockets - in practice ipc://<socket file> and tcp://<IP address>:<port> sockets are OK.\n0.0.0.0 instead of IP address is accepted and means listening on all network interfaces.\n"}}},"zeromq_preview_settings":{"type":"object","required":["enabled","period_ms"],"properties":{"enabled":{"type":"boolean","default":true,"description":"ZeroMQ preview socket is enabled."},"period_ms":{"type":"integer","format":"int64","default":1000,"description":"Period for generating preview image sent to the ZeroMQ interface in milliseconds. Default is 1 second. \nIf set to zero, all images will be sent ZeroMQ (should be used only in case of relatively slow data collection).\nThis has no effect on HTTP based preview, which updates always at rate of 1 second.\n"},"socket_address":{"type":"string","description":"PUB ZeroMQ socket for preview images. This socket operates at a reduced frame rate.\nImages are serialized using CBOR.\nAddress follows ZeroMQ convention for sockets - in practice ipc://<socket file> and tcp://<IP address>:<port> sockets are OK.\n0.0.0.0 instead of IP address is accepted and means listening on all network interfaces.\n"}}}}},"paths":{"/initialize":{"post":{"summary":"Initialize detector and data acquisition","description":"Should be used in two cases:\n  - Detector is in `Inactive` state\n  - Detector is in `Error` state\nX-ray shutter must be closed. \nThis operation will reconfigure network interface of the detector. \nDuring operation of the detector it is recommended to use the `POST /pedestal` operation instead.\nIf storage cells are used, the execution time might be few minutes.\n\nThis is async function - one needs to use `POST /wait_till_done` to ensure operation is done.\n","responses":{"200":{"description":"Initialization started"},"500":{"description":"Error within Jungfraujoch code - see output message.","content":{"application/json":{"schema":{"$ref":"#/components/schemas/error_message"}}}}}}},"/pedestal":{"post":{"summary":"Collect dark current for the detector","description":"Updates calibration of the JUNGFRAU detector. Must be in `Idle` state.\n\nX-ray shutter must be closed. Recommended to run once per hour for long integration times (> 100 us).\n\nThis is async function - one needs to use `POST /wait_till_done` to ensure operation is done.\n","responses":{"200":{"description":"Everything OK"},"500":{"description":"Error within Jungfraujoch code - see output message.","content":{"application/json":{"schema":{"$ref":"#/components/schemas/error_message"}}}}}}},"/start":{"post":{"summary":"Start detector","description":"Start data acquisition.\nDetector must be in `Idle` state.\nDefault behavior is for the call to block until detector is ready to accept soft/TTL triggers.\nHowever, this behavior can be changed by settings `async_start` to true in the request body, \nin which case the call will return immediately and one needs to use `/wait_until_running` to ensure detector is ready to run.\n","requestBody":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/dataset_settings"}}}},"responses":{"200":{"description":"Everything OK"},"400":{"description":"Input parsing or validation error","content":{"text/plain":{"schema":{"type":"string","description":"Exception error"}}}},"500":{"description":"Error within Jungfraujoch code - see output message.","content":{"application/json":{"schema":{"$ref":"#/components/schemas/error_message"}}}}}}},"/wait_until_running":{"post":{"summary":"Wait for acquisition running","parameters":[{"in":"query","name":"timeout","required":false,"schema":{"type":"integer","default":60,"minimum":0,"maximum":3600},"description":"Timeout in seconds (0 == immediate response)"}],"description":"Block execution of external script till detector and Jungfraujoch are ready to collect data.\nTo not block web server for a indefinite period of time, the procedure is provided with a timeout.\nExtending timeout is possible, but requires to ensure safety that client will not close the connection and retry the connection.\n","responses":{"200":{"description":"Detector in `Measuring` state"},"400":{"description":"Timeout parameter out of bounds"},"500":{"description":"Error within Jungfraujoch code - see output message.","content":{"application/json":{"schema":{"$ref":"#/components/schemas/error_message"}}}},"502":{"description":"Detector is inactive mode"},"504":{"description":"Timeout reached, need to restart operation"}}}},"/wait_till_done":{"post":{"summary":"Wait for acquisition done","parameters":[{"in":"query","name":"timeout","required":false,"schema":{"type":"integer","default":60,"minimum":0,"maximum":3600},"description":"Timeout in seconds (0 == immediate response)"}],"description":"Block execution of external script till initialization, data collection or pedestal is finished.\nRunning this command does not affect (cancel) running data collection, it is only to ensure synchronous execution of other software.\n\nTo not block web server for a indefinite period of time, the procedure is provided with a timeout.\nExtending timeout is possible, but requires to ensure safety that client will not close the connection and retry the connection.\n","responses":{"200":{"description":"Detector in `Idle` state, another data collection can start immediately"},"400":{"description":"Timeout parameter out of bounds"},"500":{"description":"Error within Jungfraujoch code - see output message.","content":{"application/json":{"schema":{"$ref":"#/components/schemas/error_message"}}}},"502":{"description":"Detector is inactive mode"},"504":{"description":"Timeout reached, need to restart operation"}}}},"/trigger":{"post":{"summary":"Send soft trigger to the detector","description":"Generate soft trigger","responses":{"200":{"description":"Trigger sent"}}}},"/cancel":{"post":{"summary":"Cancel running data collection","description":"Command will inform FPGA network card to stop pedestal or data collection at the current stage.\nAny frame that is currently being processed by CPU will be finished and sent to writer.\nGiven the command is making sure to gracefully stop data acquisition and detector, it might take some time to switch back after command finished to `Idle` state.\n\nIf data collection is not running, the command has no effect.\n","responses":{"200":{"description":"Cancel request sent to FPGAs (or ignored, as data collection is not running)"}}}},"/deactivate":{"post":{"summary":"Prepare detector to turn off","description":"Should be in `Idle` or `Error` state.\nCommand deactivates data acquisition and turns off detector high voltage and ASIC.\nShould be used always before turning off power from the detector.\n","responses":{"200":{"description":"Detector ready to turn off"},"500":{"description":"Error within Jungfraujoch code - see output message.","content":{"application/json":{"schema":{"$ref":"#/components/schemas/error_message"}}}}}}},"/config/detector":{"put":{"summary":"Change detector configuration","description":"Detector settings are ones that have effect on calibration, i.e., pedestal has to be collected again after changing these settings.\nThis can only be done when detector is `Idle`, `Error` or `Inactive` states.\nIf detector is in `Idle` state , pedestal procedure will be executed automatically - there must be no X-rays on the detector during the operation.\nIf detector is in `Inactive` or `Error` states, new settings will be saved, but no calibration will be executed.\n","requestBody":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/detector_settings"}}}},"responses":{"200":{"description":"Everything OK"},"400":{"description":"Input parsing or validation error","content":{"text/plain":{"schema":{"type":"string","description":"Exception error"}}}},"500":{"description":"Error within Jungfraujoch code - see output message.","content":{"application/json":{"schema":{"$ref":"#/components/schemas/error_message"}}}}}},"get":{"summary":"Get detector configuration","description":"Can be done anytime","responses":{"200":{"description":"Everything OK","content":{"application/json":{"schema":{"$ref":"#/components/schemas/detector_settings"}}}}}}},"/config/indexing":{"put":{"summary":"Change indexing algorithm settings","description":"This can only be done when detector is `Idle`, `Error` or `Inactive` states.\n","requestBody":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/indexing_settings"}}}},"responses":{"200":{"description":"Everything OK"},"400":{"description":"Input parsing or validation error","content":{"text/plain":{"schema":{"type":"string","description":"Exception error"}}}},"500":{"description":"Error within Jungfraujoch code - see output message.","content":{"application/json":{"schema":{"$ref":"#/components/schemas/error_message"}}}}}},"get":{"summary":"Get indexing configuration","description":"Can be done anytime","responses":{"200":{"description":"Everything OK","content":{"application/json":{"schema":{"$ref":"#/components/schemas/indexing_settings"}}}}}}},"/config/bragg_integration":{"put":{"summary":"Change Bragg integration settings","description":"This can only be done when detector is `Idle`, `Error` or `Inactive` states.\n","requestBody":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/bragg_integration_settings"}}}},"responses":{"200":{"description":"Everything OK"},"400":{"description":"Input parsing or validation error","content":{"text/plain":{"schema":{"type":"string","description":"Exception error"}}}},"500":{"description":"Error within Jungfraujoch code - see output message.","content":{"application/json":{"schema":{"$ref":"#/components/schemas/error_message"}}}}}},"get":{"summary":"Get Bragg integration configuration","description":"Can be done anytime","responses":{"200":{"description":"Everything OK","content":{"application/json":{"schema":{"$ref":"#/components/schemas/bragg_integration_settings"}}}}}}},"/config/file_writer":{"put":{"summary":"Change file writer settings","description":"This can only be done when detector is `Idle`, `Error` or `Inactive` states.\n","requestBody":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/file_writer_settings"}}}},"responses":{"200":{"description":"Everything OK"},"400":{"description":"Input parsing or validation error","content":{"text/plain":{"schema":{"type":"string","description":"Exception error"}}}},"500":{"description":"Error within Jungfraujoch code - see output message.","content":{"application/json":{"schema":{"$ref":"#/components/schemas/error_message"}}}}}},"get":{"summary":"Get file writer settings","description":"Can be done anytime","responses":{"200":{"description":"Everything OK","content":{"application/json":{"schema":{"$ref":"#/components/schemas/file_writer_settings"}}}}}}},"/config/instrument":{"put":{"summary":"Change instrument metadata","description":"This can only be done when detector is `Idle`, `Error` or `Inactive` states.\n","requestBody":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/instrument_metadata"}}}},"responses":{"200":{"description":"Everything OK"},"400":{"description":"Input parsing or validation error","content":{"text/plain":{"schema":{"type":"string","description":"Exception error"}}}},"500":{"description":"Error within Jungfraujoch code - see output message.","content":{"application/json":{"schema":{"$ref":"#/components/schemas/error_message"}}}}}},"get":{"summary":"Get instrument metadata","description":"Can be done anytime","responses":{"200":{"description":"Everything OK","content":{"application/json":{"schema":{"$ref":"#/components/schemas/instrument_metadata"}}}}}}},"/config/image_format":{"put":{"summary":"Change image output format","description":"This can only be done when detector is `Idle`, `Error` or `Inactive` states.\n","requestBody":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/image_format_settings"}}}},"responses":{"200":{"description":"Everything OK"},"400":{"description":"Input parsing or validation error","content":{"text/plain":{"schema":{"type":"string","description":"Exception error"}}}},"500":{"description":"Error within Jungfraujoch code - see output message.","content":{"application/json":{"schema":{"$ref":"#/components/schemas/error_message"}}}}}},"get":{"summary":"Get image output format","description":"Can be done anytime","responses":{"200":{"description":"Everything OK","content":{"application/json":{"schema":{"$ref":"#/components/schemas/image_format_settings"}}}}}}},"/config/image_format/raw":{"post":{"summary":"Configure format for raw data collection","description":"This can only be done when detector is `Idle`, `Error` or `Inactive` states.\n","responses":{"200":{"description":"Everything OK"},"500":{"description":"Error within Jungfraujoch code - see output message.","content":{"application/json":{"schema":{"$ref":"#/components/schemas/error_message"}}}}}}},"/config/image_format/conversion":{"post":{"summary":"Configure format for data collection with full conversion","description":"This can only be done when detector is `Idle`, `Error` or `Inactive` states.\n","responses":{"200":{"description":"Everything OK"},"500":{"description":"Error within Jungfraujoch code - see output message.","content":{"application/json":{"schema":{"$ref":"#/components/schemas/error_message"}}}}}}},"/config/spot_finding":{"put":{"summary":"Configure spot finding","description":"Can be done anytime, also while data collection is running","requestBody":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/spot_finding_settings"}}}},"responses":{"200":{"description":"Everything OK"},"400":{"description":"Input parsing or validation error","content":{"text/plain":{"schema":{"type":"string","description":"Exception error"}}}}}},"get":{"summary":"Get data processing configuration","description":"Can be done anytime","responses":{"200":{"description":"Everything OK","content":{"application/json":{"schema":{"$ref":"#/components/schemas/spot_finding_settings"}}}}}}},"/config/azim_int":{"put":{"summary":"Configure azimuthal integration","description":"Can be done when detector is Inactive or Idle","requestBody":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/azim_int_settings"}}}},"responses":{"200":{"description":"Everything OK"},"400":{"description":"Input parsing or validation error","content":{"text/plain":{"schema":{"type":"string","description":"Exception error"}}}},"500":{"description":"Error within Jungfraujoch code - see output message.","content":{"application/json":{"schema":{"$ref":"#/components/schemas/error_message"}}}}}},"get":{"summary":"Get azimuthal integration configuration","description":"Can be done anytime","responses":{"200":{"description":"Everything OK","content":{"application/json":{"schema":{"$ref":"#/components/schemas/azim_int_settings"}}}}}}},"/config/internal_generator_image":{"put":{"summary":"Load binary image for internal FPGA generator","description":"Load image for internal FPGA generator. This can only happen in Idle state of the detector.\nRequires binary blob with 16-bit integer numbers of size of detector in raw/converted coordinates \n(depending on detector settings).\n","parameters":[{"name":"id","in":"query","description":"Image id to upload","required":false,"schema":{"type":"integer","format":"int64","minimum":0,"maximum":127}}],"requestBody":{"content":{"application/octet-stream":{"schema":{"type":"string","format":"binary"}}}},"responses":{"200":{"description":"Everything OK"},"400":{"description":"Input parsing or validation error","content":{"text/plain":{"schema":{"type":"string","description":"Exception error"}}}}}}},"/config/internal_generator_image.tiff":{"put":{"summary":"Load TIFF image for internal FPGA generator","description":"Load image for internal FPGA generator. This can only happen in Idle state of the detector.\nRequires TIFF with 16-bit integer numbers of size of detector in raw/converted coordinates \n(depending on detector settings).\n","parameters":[{"in":"query","name":"id","description":"Image ID to upload","required":false,"schema":{"type":"integer","minimum":0,"maximum":127}}],"requestBody":{"content":{"image/tiff":{"schema":{"type":"string","format":"binary"}}}},"responses":{"200":{"description":"Everything OK"},"400":{"description":"Input parsing or validation error","content":{"text/plain":{"schema":{"type":"string","description":"Exception error"}}}}}}},"/config/select_detector":{"put":{"summary":"Select detector","description":"Jungfraujoch allows to control multiple detectors and/or region-of-interests.\nThe command allows to choose one detector from the list (ID has to be consistent with one provided by GET response).\nChanging detector will set detector to `Inactive` state and will require reinitialization.\n","requestBody":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/detector_selection"}}}},"responses":{"200":{"description":"Everything OK"},"400":{"description":"Input parsing or validation error","content":{"text/plain":{"schema":{"type":"string","description":"Exception error"}}}},"500":{"description":"Error within Jungfraujoch code - see output message.","content":{"application/json":{"schema":{"$ref":"#/components/schemas/error_message"}}}}}},"get":{"summary":"List available detectors","description":"Configured detectors that can be selected by used","responses":{"200":{"description":"Everything OK","content":{"application/json":{"schema":{"$ref":"#/components/schemas/detector_list"}}}}}}},"/config/zeromq_preview":{"put":{"summary":"Set ZeroMQ preview settings","description":"Jungfraujoch can generate preview message stream on ZeroMQ SUB socket.\nHere settings of the socket can be adjusted.\nWhile the data structure contains also socket_address, this cannot be changed via HTTP and is ignore in PUT request.\nOptions set with this PUT request have no effect on HTTP based preview.\n","requestBody":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/zeromq_preview_settings"}}}},"responses":{"200":{"description":"Everything OK"},"400":{"description":"Input parsing or validation error","content":{"text/plain":{"schema":{"type":"string","description":"Exception error"}}}},"500":{"description":"Error within Jungfraujoch code - see output message.","content":{"application/json":{"schema":{"$ref":"#/components/schemas/error_message"}}}}}},"get":{"summary":"Get ZeroMQ preview settings","responses":{"200":{"description":"Everything OK","content":{"application/json":{"schema":{"$ref":"#/components/schemas/zeromq_preview_settings"}}}}}}},"/config/zeromq_metadata":{"put":{"summary":"Set ZeroMQ metadata settings","description":"Jungfraujoch can generate metadata message stream on ZeroMQ PUB socket. This stream covers all images.\nHere settings of the socket can be adjusted.\nWhile the data structure contains also socket_address, this cannot be changed via HTTP and is ignore in PUT request.\n","requestBody":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/zeromq_metadata_settings"}}}},"responses":{"200":{"description":"Everything OK"},"400":{"description":"Input parsing or validation error","content":{"text/plain":{"schema":{"type":"string","description":"Exception error"}}}},"500":{"description":"Error within Jungfraujoch code - see output message.","content":{"application/json":{"schema":{"$ref":"#/components/schemas/error_message"}}}}}},"get":{"summary":"Get ZeroMQ metadata socket settings","responses":{"200":{"description":"Everything OK","content":{"application/json":{"schema":{"$ref":"#/components/schemas/zeromq_metadata_settings"}}}}}}},"/config/dark_mask":{"put":{"summary":"Set configuration for dark data collection to calculate mask","description":"This is only possible when operating DECTRIS detectors at the moment; 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       var container = document.getElementById('redoc');
       Redoc.hydrate(__redoc_state, container);
diff --git a/common/DiffractionExperiment.cpp b/common/DiffractionExperiment.cpp
index 0a089fa4..1015bd0b 100644
--- a/common/DiffractionExperiment.cpp
+++ b/common/DiffractionExperiment.cpp
@@ -8,7 +8,6 @@
 #include "NetworkAddressConvert.h"
 #include "JFJochCompressor.h" // For ZSTD_USE_JFJOCH_RLE
 #include "DiffractionExperiment.h"
-#include "../image_analysis/bragg_prediction/BraggPrediction.h"
 
 #include "CUDAWrapper.h"
 #include "JFJochException.h"
@@ -612,23 +611,23 @@ void DiffractionExperiment::CheckDataProcessingSettings(const SpotFindingSetting
     check_min("Photon count threshold", settings.photon_count_threshold, 0);
     check_min("Minimum pixels per spot", settings.min_pix_per_spot.value_or(2), 1);
     check_min("Maximum pixels per spot", settings.max_pix_per_spot, settings.min_pix_per_spot.value_or(2) + 1);
-    check_finite("Spot finding low resolution limit", settings.low_resolution_limit);
-
-    // An unset high-resolution limit means "as far as the detector reaches", so there is nothing to check.
-    // A value that is present still has to be finite - NaN fails every comparison below, so testing it
-    // inside the branch would let it through unchecked.
+    // An unset limit means "no limit at that end", so there is nothing to check. A value that is present
+    // still has to be finite - NaN fails every comparison below, so testing it inside the branch would
+    // let it through unchecked.
     if (settings.high_resolution_limit.has_value())
         check_finite("Spot finding high resolution limit", *settings.high_resolution_limit);
-    if (settings.high_resolution_limit.value_or(0.0f) > 0) {
+    if (settings.low_resolution_limit.has_value())
+        check_finite("Spot finding low resolution limit", *settings.low_resolution_limit);
+
+    if (settings.high_resolution_limit.has_value()) {
         check_min("Spot finding high resolution limit", *settings.high_resolution_limit, 0.5);
         check_max("Spot finding high resolution limit", *settings.high_resolution_limit, 50.0);
-        if (settings.low_resolution_limit > 0) {
-            check_min("Spot finding low resolution limit", settings.low_resolution_limit,
+        if (settings.low_resolution_limit.has_value())
+            check_min("Spot finding low resolution limit", *settings.low_resolution_limit,
                       *settings.high_resolution_limit);
-        }
-    } else if (settings.low_resolution_limit > 0) {
-        check_min("Spot finding low resolution limit", settings.low_resolution_limit, 1.0);
-        check_max("Spot finding low resolution limit", settings.low_resolution_limit, 50.0);
+    } else if (settings.low_resolution_limit.has_value()) {
+        check_min("Spot finding low resolution limit", *settings.low_resolution_limit, 1.0);
+        check_max("Spot finding low resolution limit", *settings.low_resolution_limit, 50.0);
     }
 
     check_min("Ice ring width in Q-space (A^-1)", settings.ice_ring_width_Q_recipA, 0.0);
@@ -1121,18 +1120,12 @@ int64_t DiffractionExperiment::GetImagesPerFile() const {
 
 int64_t DiffractionExperiment::GetImageBufferLocationSize() const {
     // A buffer slot holds the compressed image plus the per-image CBOR metadata (spot list, reflection
-    // list, azimuthal profile, ...). The reflection list dominates and is bounded by
-    // BraggPrediction::kOnlineMaxReflections at ~170 B each - the ONLINE limit, not the offline one:
-    // the slot size divides a fixed total buffer, so sizing every slot for the offline limit would cut
-    // the slot count, and the receiver's ability to absorb a burst, by about three. Derived from that
-    // constant
-    // rather than restate it - the two used to be written down separately and a raised cap would have
-    // silently outgrown the slot. Half again on top covers the capped spot list and the profile. A
-    // frame whose metadata still does not fit is dropped individually by the receiver rather than
-    // aborting the collection.
-    constexpr int64_t kReflectionBytes = 170;
-    const int64_t metadata = BraggPrediction::kOnlineMaxReflections * kReflectionBytes * 3 / 2;
-    return GetMaxCompressedSize() + metadata;
+    // list, azimuthal profile, ...). The reflection list is bounded by the ONLINE cap
+    // BraggPrediction::kOnlineMaxReflections at ~170 B each, but it is not the whole of it: the capped
+    // spot list and the three azimuthal arrays at up to 65534 bins add another megabyte, and the
+    // measured worst case is ~2.9 MB. A frame whose metadata still does not fit is dropped
+    // individually by the receiver rather than aborting the collection.
+    return GetMaxCompressedSize() + kImageMetadataHeadroom;
 }
 
 float DiffractionExperiment::GetLossyCompressionSerialMX() const {
diff --git a/common/DiffractionExperiment.h b/common/DiffractionExperiment.h
index f428961d..a1f3dafd 100644
--- a/common/DiffractionExperiment.h
+++ b/common/DiffractionExperiment.h
@@ -234,6 +234,11 @@ public:
     int64_t GetMaxCompressedSize() const;
     int64_t GetImageBufferLocationSize() const;
 
+    // Room reserved in every image-buffer slot for the per-image CBOR metadata, on top of the
+    // compressed image. CBORSerialize_Image_MetadataHeadroom holds it against the largest metadata
+    // the serializer can produce, so change the two together.
+    static constexpr int64_t kImageMetadataHeadroom = 4 * 1024 * 1024;
+
     int64_t GetDataStreamsNum() const;
     int64_t GetModulesNum(uint16_t data_stream) const;
     int64_t GetModulesNum() const;
diff --git a/docs/ACKNOWLEDGEMENT.md b/docs/ACKNOWLEDGEMENT.md
index 733552b5..043a1f43 100644
--- a/docs/ACKNOWLEDGEMENT.md
+++ b/docs/ACKNOWLEDGEMENT.md
@@ -12,4 +12,13 @@ the result, follows Jon Wright (ESRF): "Experiences with GPU decompression for b
 data", HDF5 User Group meeting (2021), and [bslz4decoders](https://github.com/jonwright/bslz4decoders).
 The CUDA kernels in Jungfraujoch are its own, but the approach is his.
 
+Spot extraction groups strong pixels into spots with the sparse connected-component labelling of the
+ACTS traccc project: P. Gessinger, H. M. Gray, A. Krasznahorkay, C. Leggett, J. Niermann,
+A. Salzburger, S. N. Swatman and B. Yeo, "traccc: GPU track reconstruction library for HEP
+experiments" (2025), [arXiv:2505.22822](https://arxiv.org/abs/2505.22822);
+[traccc](https://github.com/acts-project/traccc). The CPU spot extractor adapts its SparseCCL source,
+and the CUDA spot extractor follows the design of its GPU counterpart - a backward-neighbour graph
+over a sorted hit list, resolved by a parallel union-find. traccc is MPL-2.0; see
+[THIRD_PARTY_NOTICES.md](THIRD_PARTY_NOTICES.md).
+
 This software uses Viridis, Magma and Inferno colormaps from Matplotlib under its BSD-compatible license
diff --git a/docs/CHANGELOG.md b/docs/CHANGELOG.md
index 662a93f4..d391fdf0 100644
--- a/docs/CHANGELOG.md
+++ b/docs/CHANGELOG.md
@@ -3,57 +3,63 @@
 ### 1.0.0-rc.161
 This is an UNSTABLE release. It includes many experimental features, as well as many AI generated fixes. We recommend using rc.152 for production use.
 
-* Spot finding: Self-calibrating **adaptive detection** added, now the **default** for rotation as well as stills - no per-dataset threshold tuning; a fused GPU engine runs it together with azimuthal integration in one image pass.
-* Spot finding: Serial stills pick `--min-pix-per-spot` per image; connected components run on the GPU; detection is configurable over the API, where a `high_resolution_limit` of 0 means "no limit" instead of throwing.
-* Resolution limits: Bragg integration, azimuthal integration and spot finding all default to **as far as the detector reaches**, replacing a fixed 1.0 Å integration limit and a 1.5 Å rotation spot-finding limit that silently discarded everything beyond them; `--integration-high-resolution` and `--spot-high-resolution` still set one by hand.
-* Bragg prediction: How far the predictor walks the lattice is a setting (`bragg_integration_settings.max_hkl`) instead of a fixed 100, derived per crystal offline from the refined cell (`--max-hkl` overrides); the broker keeps a fixed bootstrap so a live acquisition has a predictable per-image cost.
-* Bragg integration: The local background ring is now made robust with a **high-side sigma clip** (`--background-clip <n>`, default 4) instead of the symmetric trimmed mean, which is biased low on Poisson data and added ~5 counts to every partial. The trim stays reachable with `--background-trim <f>`. Expect `<I/sigma>` to fall and edge `R_meas` to rise - that is the removed bias, not a regression; per-shell agreement with independent processing improves.
-* Bragg integration: The **uncertainty of the background estimate** is now propagated into `sigma`; both engines omitted it, which understated every reflection's `sigma` by `sqrt(1 + n_signal/n_bkg)` = 1.109 with the shipped stencil. Expect `<I/sigma>` to fall by that factor on every dataset.
-* Bragg integration: New **radial background correction** (`--background-radial[=on|off|auto]`, default off) for the bias a curved radial background leaves in a flat ring mean - tens of counts on a single reflection sitting on an ice ring. `auto` applies it per image where that image's ice score shows a *smooth* powder ring, which targets correctly (it fires on ten battery crystals, all ice-positive) but costs 1.35x the wall clock and is sign-mixed on the merge statistics, so it stays opt-in: measured against a fixed atomic model it removes 43 % of the ice bands' excess amplitude on smooth ice, but on ice made of discrete crystallite spots - where a radius-only background model has nothing to fit - it makes the bias worse, and the gate separates the two.
-* rugnux: **Ice-ring handling now runs only when the crystal is measured to have ice** - the eleven fixed bands cost 16-26 % of the unique reflections whether it does or not. Detection uses two channels, the spot finder's peak-excluded radial profile (`--ice-min-score`, default 1.5) and found spots on the rings against ice-free flanks (`--ice-min-spot-ratio`, default 2.0), which catch smooth and textured ice respectively; the previous score was read off the plain azimuthal profile, where strong reflections in a ring's bin score as ice.
-* rugnux: The merge-time **ice-ring mask has been removed**. Measured against anomalous peak height it returned -0.001 +- 0.018 sigma while deleting reflections whose mean `I/sigma` was *above* the dataset average, leaving `R_meas`, CC1/2 and ISa unchanged and the affected shell 17 completeness points short. Ice reflections are still kept out of the scale fit and the space-group search, as every established scaling program does, and are kept in the final merge.
-* rugnux: **Multiplicity was over-reported** by the rotation merge: the per-shell observation counter rode on the R_meas re-walk, which deliberately applies a wider filter than the merge, so observations the merge had excluded were counted against a unique count that excluded them - and a group the merge dropped entirely has a NaN resolution, which `ResolutionShells::GetShell` silently binned as the lowest-resolution shell rather than rejecting. Only counts were affected; intensities, sigmas, R_meas, CC1/2, completeness and ISa were always right.
-* rugnux: **The first-pass rotation spots are now found rather than taken from the file**. `--redo-rotation-spots` (now the behaviour) and the reuse path are removed. The stored spots were the acquisition's, found at its threshold with its ice-band entries already dropped by its spot budget, so the lattice search never saw the spot-finding settings. Costs ~3 % of the run; over the rotation battery `R_meas` improves on 9 of the 10 crystals that move materially.
-* rugnux: Rotation indexing **no longer keeps a metric symmetry that indexes almost nothing**. The Bravais class is decided from the unrefined FFT candidate against a fixed 3° tolerance, so a lattice pseudo-symmetric to a few tenths of a degree is promoted a class too far and the constraint then snaps a real angle to the ideal one - measured, one crystal's promoted cell indexed 2 of 60 validation frames where its own primitive cell indexed 39, and the run died. The first pass now drops such a promotion. Battery: 33/37 space groups matching XDS with one hard failure becomes 34/37 with none, every other crystal identical.
-* rugnux: New **detector-calibration mode** (`--mode calibration`) - fit PONI x/y, the two tilts and the distance to a calibrant's powder rings over the whole dataset and write a pyFAI `.poni` file. `--calibrant lab6|agbh|ceo2|si|ice` (ice calibrates a real experiment against its own ice rings, so no calibrant exposure is needed); `--calibration rings` (default) sums the azimuthally-binned profile over every image and fits the ring arcs in it, `--calibration spots` pools the found spots instead. Measured on a LaB6 distance series, both routes land within 0.1 px of an independent reference, and on a crystal with smooth ice the beam centre moves from 5.5 px off to 0.3 px.
+* Spot finding: Self-calibrating **adaptive detection** added, now the **default** for rotation as well as stills; a fused GPU engine runs it together with azimuthal integration in one image pass.
+* Spot finding: Serial stills pick `--min-pix-per-spot` per image, connected components run on the GPU, and detection is configurable over the API.
+* Spot finding: `--spot-sigma` now defaults to 4.0 (was 3.0) and `--max-spots` to 1000 spots per image (was 250).
+* Resolution limits: Bragg integration, azimuthal integration and spot finding all default to **as far as the detector reaches**; `--integration-high-resolution` and `--spot-high-resolution` still set one by hand, and 0 means "no limit" at either end.
+* Bragg prediction: How far the predictor walks the lattice is a setting (`bragg_integration_settings.max_hkl`, `--max-hkl`) instead of a fixed 100, derived per crystal offline and held fixed online.
+* Bragg integration: The local background ring is made robust with a **high-side sigma clip** (`--background-clip <n>`, default 4) instead of the symmetric trimmed mean; the trim stays reachable with `--background-trim <f>`.
+* Bragg integration: The **uncertainty of the background estimate** is now propagated into `sigma`, which both engines previously omitted.
+* Bragg integration: New **radial background correction** (`--background-radial[=on|off|auto]`, default off); `auto` applies it per image where that image's ice score shows a smooth powder ring.
+* rugnux: **Ice-ring handling now runs only when the crystal is measured to have ice**, detected on two channels - the spot finder's peak-excluded radial profile (`--ice-min-score`, default 1.5) and found spots on the rings against ice-free flanks (`--ice-min-spot-ratio`, default 2.0).
+* rugnux: The merge-time **ice-ring mask has been removed**; ice reflections are still kept out of the scale fit and the space-group search, and kept in the final merge.
+* rugnux: `spot_finding_settings.ice_ring_width_q_recipA` now defaults to 0.03 1/Å (was 0.02), matching the offline default.
+* rugnux: **Multiplicity is no longer over-reported** by the rotation merge; only the counts were affected, never intensities, sigmas, `R_meas`, CC1/2, completeness or ISa.
+* rugnux: **The first-pass rotation spots are now found rather than taken from the file**; `--redo-rotation-spots` (now the behaviour) and the reuse path are removed.
+* rugnux: Rotation indexing **no longer keeps a metric symmetry that indexes almost nothing**.
+* rugnux: New **detector-calibration mode** (`--mode calibration`) fits PONI x/y, the two tilts and the distance to a calibrant's powder rings over the whole dataset and writes a pyFAI `.poni` file, with `--calibrant lab6|agbh|ceo2|si|ice` and `--calibration rings|spots` (default `rings`).
+* Powder calibration: The face-centred calibrants (`ceo2`, `si`) no longer list their systematically absent rings, so the fit starts from (111) rather than the extinct (100), and the triclinic `agbh` ring list covers both signs of h and k instead of one octant.
+* rugnux: `--polarization` now reaches `--mode azint`, which parsed the flag and then discarded it; that mode also applies the same polarization default as every other mode.
+* rugnux: `--stride` no longer mis-links the images in the written `_process.h5` - image *i* of the file now carries source image *start + i x stride*, not *start + i*, so each frame's picture sits next to its own analysis. The per-image arrays are also sized correctly when the stride does not divide the range evenly.
+* Spot finding: `--spot-low-resolution 0` (and an omitted `low_resolution_limit` over the API) means "no low-resolution limit", mirroring the high-resolution end.
 * rugnux: **`--mode` replaces `--azint-only` and `--scale`** (see below).
-* jfjoch_viewer: **"Analyze dataset" can run the detector calibration** over the whole dataset. The settings panel's MX/AzInt toggle gains a third *Calib* page carrying the calibrant (now including `ice`, matching the CLI) and the rings/spots method; the run writes a `.poni` next to the other outputs and reports the fitted PONI, tilts and distance against the header values in their own window.
-* Powder calibration: the ring geometry fit can now read its rings off an **azimuthally-binned profile summed over a run** instead of a spot list from one image (`RingsFromAzimuthalProfile`). A powder ring is an arc, not a set of spots, and its roundness fixes the beam centre without reference to the calibrant's d-spacings or the detector distance - the one parameter Bragg data constrain worst. The extraction window is capped at half the gap to the neighbouring ring (hexagonal ice has three rings within 0.06 1/A, which a fixed window merged into one), and where only one ring is in reach the tilts are held rather than fitted, since a single ring cannot separate them from the centre.
+* jfjoch_viewer: **"Analyze dataset" can run the detector calibration** over the whole dataset, from a new *Calib* page in the settings panel; the run writes a `.poni` next to the other outputs and reports the fitted PONI, tilts and distance against the header values.
+* Powder calibration: the ring geometry fit can now read its rings off an **azimuthally-binned profile summed over a run** instead of a spot list from one image, and holds the tilts rather than fitting them where only one ring is in reach.
 * Powder calibration: `.poni` files write `Poni1`/`Poni2` as (beam + 0.5) x pixel size, matching pyFAI's edge-of-sensor origin; the pixel-coordinate convention is documented in `docs/DETECTOR_GEOMETRY.md`.
 * jfjoch_viewer: the beam-centre cross is aligned with the spot and prediction markers.
 * rugnux: De-novo **space-group search** substantially more robust - centering ranked by net absences and judged on absent-class strength, merohedral-twin over-promotion vetoed, and genuine high-symmetry groups recovered on weak data.
 * rugnux: The space-group search takes systematic absences from the merge of all observations, needs at least three control reflections on an axial row to claim a **screw axis**, and no longer alters the production merge.
-* rugnux: The space-group search no longer **starves on a low-ISa merge**: its fixed `I/sigma >= 3` cut could select nothing at all, since a merged sigma is floored so that no reflection reads above `ISa = 1/b`, leaving every operator correlation undefined and the point group at 1. The cut is now capped at the merge's own quantile, and is unchanged on healthy merges.
-* rugnux: The one-line summary **names every space group the data cannot separate** (`I23 (No. 197) or I2(1)3 (No. 199) - indistinguishable from these data`), instead of reporting only the representative as if it had been measured.
+* rugnux: The space-group search no longer **starves on a low-ISa merge** - its `I/sigma` cut is capped at the merge's own quantile, and is unchanged on healthy merges.
+* rugnux: The one-line summary **names every space group the data cannot separate** (`I23 (No. 197) or I2(1)3 (No. 199) - indistinguishable from these data`), instead of reporting only the representative.
 * rugnux: The per-image mosaicity is fitted from the strongest 250 spots, so the indexing spot budget no longer sets it.
-* rugnux: The per-frame crystal orientation is smoothed before scaling and partiality recomputed from it, so per-image refinement noise no longer reaches the merged intensities. Frames that never indexed are now excluded from that smoothing - their all-zero lattice passed the validity check and was averaged into their neighbours', which on a partly-indexing crystal chose a smoothing window nine times too wide.
-* rugnux: Rotation post-refinement **reports the goniometer rotation scale** and warns beyond 0.5 %. A stage that turns further than commanded is invisible in the file, since the stored angles are the commanded ones, and reads as crystal drift instead. Report only - nothing is corrected.
-* rugnux: Stills **partiality post-refinement** added, on by default (`--simple-stills` disables); several non-helping stills scaling/detection knobs removed.
+* rugnux: The per-frame crystal orientation is smoothed before scaling and partiality recomputed from it, with frames that never indexed excluded from the smoothing.
+* rugnux: Rotation post-refinement **reports the goniometer rotation scale** and warns beyond 0.5 %; nothing is corrected.
+* rugnux: Stills **partiality post-refinement** added, on by default (`--simple-stills` disables); `--still-partiality`, `--partiality-uncertainty` and several other non-helping stills knobs are removed.
 * rugnux: **Scaling** hardened against a collapsed per-frame scale on the stills path as well as rotation, and the merged-sigma systematic floor is kept when ISa is too degenerate to report.
 * rugnux: `--min-image-cc` now works for rotation data (opt-in); new `--search-min-zeta` (rotation default 0.85); reports how close a symmetry axis lies to the spindle.
-* Performance: bitshuffle+LZ4 images are **decoded on the GPU** rather than on the host (1.8x on a large rotation run), with the bitshuffle inverse fused into preprocessing so the decompressed frame is never held in device memory (0.62 -> 0.41 ms/frame at 18 Mpx, ~144 MB less per worker); first-pass rotation indexing refines candidate cells in parallel instead of on one thread per scheme.
-* GPU decoding: a corrupt or truncated chunk was decoded as far as it went, leaving the rest of the frame holding the previous image, so the decode is now checked and reported instead; bitshuffle blocks larger than 48 kB decode rather than failing, and anything the device decoder cannot handle falls back to host decompression instead of stopping the run.
+* Performance: bitshuffle+LZ4 images are **decoded on the GPU** rather than on the host, with the bitshuffle inverse fused into preprocessing so the decompressed frame is never held in device memory; first-pass rotation indexing refines candidate cells in parallel instead of on one thread per scheme.
+* GPU decoding: a corrupt or truncated chunk is now detected and reported instead of leaving the rest of the frame holding the previous image; bitshuffle blocks larger than 48 kB decode rather than failing, and anything the device decoder cannot handle falls back to host decompression.
 * Performance: Assorted work removed from the hot paths - GPU lookup tables shared per device, fewer device allocations, cheaper candidate filtering and merged-file writing; jfjoch_viewer image rendering and interaction improved.
-* Reader: A stored dataset is read as **int32**, so the saturation cap comes from the file's own `saturation_value` (32-bit files were capping at 32767 and dropping their strongest reflections; 16- and 8-bit files at half their range).
-* GPU: Spot finding, merging and Bragg prediction now match the CPU path and reproduce run to run. Adaptive detection sums its per-ring statistics in integers, so the threshold no longer depends on the order the GPU happens to schedule the reduction in and the two engines agree exactly.
-* rugnux: Stills geometry refinement took frames from a shared cursor and stopped on a shared counter, so the refined geometry varied between runs and with `-N` and was fitted to the start of the run; it now draws fixed stripes spanning the whole run.
+* Reader: A stored dataset is read as **int32**, so the saturation cap comes from the file's own `saturation_value` rather than from the stored bit depth.
+* GPU: Spot finding, merging and Bragg prediction now match the CPU path and reproduce run to run; adaptive detection sums its per-ring statistics in integers, so the two engines agree exactly.
+* rugnux: Stills geometry refinement draws fixed stripes spanning the whole run, so the refined geometry no longer varies between runs or with `-N`.
 * rugnux: **Geometry refinement** no longer commits a solve that did not converge, and per-image refinement weights spots by confidence.
 * Lattice search: Corrected the reindex matrices for two Niggli characters.
 * Azimuthal integration: A flat ring no longer yields a NaN standard deviation, and a low-Q limit above the maximum is rejected instead of producing undefined behaviour.
 * rugnux: Bad command-line input is **reported** (exit 1) instead of terminating the process, and a run in which nothing indexes still writes a `_process.h5`.
 * Broker / writer / image pusher: Image-slot lifetime, locking and deactivation fixes; tearing a TCP connection down is serialised per connection; and per-image datasets are sized by the images actually written, so a frame that failed mid-run no longer truncated the last image out of the file.
-* rugnux / broker: rugnux exited before reading an image on hosts with more than 128 hardware threads, so the refinement thread count is clamped; a config without a `bragg_integration` block now gets the documented fixed `max_hkl` rather than deriving it per crystal; and the device decode time is reported as compression time again, so that plot and `/entry/profiling/compressionTime` are populated.
-* Packaging: The Debian/Ubuntu broker package is named `jfjoch`, not `jfjoch-jfjoch` (it declares the rename, so `apt upgrade` handles it); the DKMS driver package's `postinst`/`prerm` are executable, so the `.deb` runs them; and the Windows/macOS installers no longer carry the Linux-only Freedesktop menu entry and icon.
-* jfjoch_writer: `--verbose` no longer swallows the following argument, and the usage message names the root directory as a path. The `-H`/`--http_port` option has done nothing since the HTTP status interface was dropped.
-* Build: `PROJECT_VERSION` is derived from the `VERSION` file rather than hardcoded, and the version is read from it once instead of in two places; and the Bragg integrator no longer uses `M_PI`, which is not standard C++ and left `image_analysis` - which the Windows viewer builds - failing to compile under MSVC.
-* Docs: Document device-side bitshuffle+LZ4 image decoding in CPU_DATA_ANALYSIS.md; add a Release contents page (what each artefact ships, its CPU baseline, and how the CUDA builds behave without a GPU); correct the RHEL 9 repository URLs and package names; bring the rugnux (`--model`), viewer (processing jobs) and writer pages up to date.
+* rugnux / broker: The refinement thread count is clamped, so rugnux starts on hosts with more than 128 hardware threads; a config without a `bragg_integration` block gets the documented fixed `max_hkl`; and the device decode time is reported as compression time again, so that plot and `/entry/profiling/compressionTime` are populated.
+* Packaging: The Debian/Ubuntu broker package is named `jfjoch`, not `jfjoch-jfjoch` (it declares the rename, so `apt upgrade` handles it); the DKMS driver package's `postinst`/`prerm` are executable; and the Windows/macOS installers no longer carry the Linux-only Freedesktop menu entry and icon.
+* jfjoch_writer: `--verbose` no longer swallows the following argument, and the usage message names the root directory as a path; `-H`/`--http_port` has done nothing since the HTTP status interface was dropped.
+* Build: `PROJECT_VERSION` is derived from the `VERSION` file rather than hardcoded, and the Bragg integrator no longer uses `M_PI`, which left `image_analysis` failing to compile under MSVC.
+* Docs: New Release contents page; device-side bitshuffle+LZ4 image decoding documented in CPU_DATA_ANALYSIS.md; corrected RHEL 9 repository URLs and package names; the rugnux, viewer and writer pages brought up to date.
 
 **Breaking change to the rugnux command line:**
 * `--azint-only` and `--scale` are **removed**, replaced by `--mode azint` and `--mode scale`; the full pipeline is `--mode mx` and remains the default. A script passing the old flags now fails with the list of valid modes rather than silently running the wrong one.
 
 **Breaking changes to OpenAPI** - regenerate the client (`jfjoch-client` 1.0.0-rc.161, `frontend/src/client`) or read the affected fields as optional:
 * `image_scale_b` is removed from the `plot_type` enum, so a client requesting that plot now gets an error rather than a curve.
-* `azim_int_settings.high_q_recipA` and `spot_finding_settings.high_resolution_limit` are no longer `required`. Both mean "as far as the detector reaches" when unset and are omitted from the response instead of carrying a placeholder value, which raises in a client generated from an rc.160-or-earlier spec.
+* `azim_int_settings.high_q_recipA`, `spot_finding_settings.high_resolution_limit` and `spot_finding_settings.low_resolution_limit` are no longer `required`. All three mean "no limit at that end" when unset and are omitted from the response instead of carrying a placeholder value, which raises in a client generated from an rc.160-or-earlier spec. A value of 0 is still accepted and means the same thing.
 
 **Breaking changes to the stored formats** - a consumer reading these fields must treat them as optional:
 * The per-image image-scale B factor is no longer computed, so `/entry/MX/imageScaleBFactor` is absent from newly written HDF5 files and the corresponding key is absent from the CBOR DataMessage and END blocks. Files written by rc.160 and earlier still contain it and still open; nothing in the pipeline reads it any more.
diff --git a/docs/RUGNUX.md b/docs/RUGNUX.md
index ec658786..ddf8f9f0 100644
--- a/docs/RUGNUX.md
+++ b/docs/RUGNUX.md
@@ -260,7 +260,7 @@ Spot finding:
 | `--no-adaptive-spots` | Turn adaptive detection off and use the fixed `--spot-threshold` / `--spot-sigma` finder |
 | `--spot-false-pixels <num>` | Adaptive-detection operating point: expected noise pixels tolerated per frame (default: 100; implies `--adaptive-spots`) |
 | `--spot-high-resolution <num>` | High-resolution limit for spot finding, Å. Omitted (or 0): no resolution clipping — spot finding extends as far as the detector reaches, for rotation data as well as stills |
-| `--spot-low-resolution <num>` | Low-resolution limit for spot finding, Å (default: 50; lower it, e.g. 24, to exclude the direct-beam halo on weak serial data) |
+| `--spot-low-resolution <num>` | Low-resolution limit for spot finding, Å (default: 50; lower it, e.g. 24, to exclude the direct-beam halo on weak serial data; 0 removes the limit) |
 | `--min-pix-per-spot <num>` | Minimum connected strong pixels per spot. **If omitted, min-pix is chosen per image** (stills indexing): the frame is indexed at min-pix 3/2/1 and the one maximising indexed-spot count × indexed fraction is kept. Give an explicit value to force a fixed min-pix instead. |
 | `--max-spots <num>` | Maximum spots kept per image (the strongest ones) and handed to indexing (default: 1000) |
 | `--detect-ice-rings[=on\|off]` | Flag ice-ring spots (de-prioritised in indexing) and exclude ice-ring reflections from scaling. Default: the master file's `detect_ice_rings`, or — where the file carries no such key — **on for rotation and off for stills** |
diff --git a/docs/THIRD_PARTY_NOTICES.md b/docs/THIRD_PARTY_NOTICES.md
index 80564163..28580fb9 100644
--- a/docs/THIRD_PARTY_NOTICES.md
+++ b/docs/THIRD_PARTY_NOTICES.md
@@ -53,6 +53,7 @@ These are copied into the source tree (see the path) rather than fetched.
 | [LZ4](https://github.com/lz4/lz4) | `compression/lz4/` | Yann Collet | BSD-2-Clause | [lz4.txt](https://gitea.psi.ch/mx/jungfraujoch/src/branch/main/licenses/lz4.txt) |
 | [HLS arbitrary-precision types](https://github.com/Xilinx/HLS_arbitrary_Precision_Types) | `fpga/include/` | Xilinx, Inc. | Apache-2.0 | [xilinx-hls-headers.txt](https://gitea.psi.ch/mx/jungfraujoch/src/branch/main/licenses/xilinx-hls-headers.txt) |
 | [GEMMI](https://github.com/project-gemmi/gemmi) | `gemmi_gph/` | Global Phasing Ltd. | MPL-2.0 | [gemmi.txt](https://gitea.psi.ch/mx/jungfraujoch/src/branch/main/licenses/gemmi.txt) |
+| [traccc (ACTS)](https://github.com/acts-project/traccc) | `image_analysis/spot_finding/StrongPixelSet.cpp`, `SpotExtractorGPU.cu` | CERN, for the benefit of the ACTS project | MPL-2.0 | [traccc.txt](https://gitea.psi.ch/mx/jungfraujoch/src/branch/main/licenses/traccc.txt) |
 | [xbflash.qspi](https://github.com/Xilinx/XRT) | `tools/xbflash.qspi/` | Xilinx / AMD | Apache-2.0 | [xbflash-qspi.txt](https://gitea.psi.ch/mx/jungfraujoch/src/branch/main/licenses/xbflash-qspi.txt) |
 | [wingetopt](https://github.com/alex85k/wingetopt) | `tools/wingetopt/` | Todd C. Miller; The NetBSD Foundation | ISC AND BSD-2-Clause | [wingetopt.txt](https://gitea.psi.ch/mx/jungfraujoch/src/branch/main/licenses/wingetopt.txt) |
 
@@ -79,9 +80,14 @@ served frontend, so the shipped web UI carries its own attribution.
 
 ## Notes on weak-copyleft and attribution-sensitive components
 
-* **MPL-2.0** (Eigen, GEMMI, libzmq): file-level copyleft. GEMMI is vendored in `gemmi_gph/` in
-  trimmed form; libzmq is fetched at build time; Eigen is provided externally (header-only). The
+* **MPL-2.0** (Eigen, GEMMI, libzmq, traccc): file-level copyleft. GEMMI is vendored in `gemmi_gph/`
+  in trimmed form; libzmq is fetched at build time; Eigen is provided externally (header-only). The
   corresponding source is available from each project upstream.
+* **traccc** is the one entry that is not a vendored directory. Its sparse connected-component
+  labelling enters two otherwise first-party files: `StrongPixelSet.cpp` adapts the SparseCCL source,
+  and `SpotExtractorGPU.cu` follows the design of its GPU counterpart. MPL-2.0 is file-level, so both
+  files name the origin at the top and are covered by `licenses/traccc.txt`. See
+  [ACKNOWLEDGEMENT.md](ACKNOWLEDGEMENT.md) for the citation.
 * **FFTW** is GPL-2.0-or-later — compatible with, and absorbed by, this project's GPL-3.0 license.
 * **Apache-2.0** components: where upstream ships a `NOTICE` file, it is reproduced in the
   corresponding `licenses/` text.
diff --git a/docs/python_client/docs/SpotFindingSettings.md b/docs/python_client/docs/SpotFindingSettings.md
index dc87e0f0..0ab87e19 100644
--- a/docs/python_client/docs/SpotFindingSettings.md
+++ b/docs/python_client/docs/SpotFindingSettings.md
@@ -12,7 +12,7 @@ Name | Type | Description | Notes
 **min_pix_per_spot** | **int** |  | 
 **max_pix_per_spot** | **int** |  | 
 **high_resolution_limit** | **float** | High resolution limit for spot finding [Angstrom]. Optional: if omitted, spot finding extends as far as the detector reaches, i.e. the detection is not clipped in resolution.  | [optional] 
-**low_resolution_limit** | **float** | Low resolution limit for spot finding [Angstrom] | 
+**low_resolution_limit** | **float** | Low resolution limit for spot finding [Angstrom]. Optional: if omitted, spot finding is not clipped at the low-resolution end. A value of 0 is accepted and means the same thing.  | [optional] 
 **high_resolution_limit_for_spot_count_low_res** | **float** | High resolution threshold to consider spot \&quot;low resolution\&quot; [Angstrom] | 
 **quick_integration** | **bool** | Quick integration of Bragg spots in diffraction images. If enabled it will likely reduce performance of Jungfraujoch for datasets with a very high indexing rate. (experimental feature)  | [default to False]
 **ice_ring_width_q_recip_a** | **float** | Half-width of the ice ring band in q (1/A). Matches the offline default in image_analysis/spot_finding/SpotFindingSettings.h, which was set from a measured ring FWHM of ~0.06; the two must agree or the same data gets a narrower ice band online. | [default to 0.03]
diff --git a/frame_serialize/CBORStream2Deserializer.cpp b/frame_serialize/CBORStream2Deserializer.cpp
index 35aaa7cf..7acc12dd 100644
--- a/frame_serialize/CBORStream2Deserializer.cpp
+++ b/frame_serialize/CBORStream2Deserializer.cpp
@@ -1480,8 +1480,16 @@ namespace {
                         message.rotation_extra_lattices.emplace_back(tmp);
                 }
                 cborErr(cbor_value_leave_container(&value, &array_value));
-            } else
+            } else {
+                // Skip a key this build does not know, so an older reader survives a newer sender.
+                // A tag takes two advances - the first lands ON the tagged item, not past it - and the
+                // typed arrays in this block are all tagged, so one advance would leave the parser
+                // sitting on the payload and the next key would be read as a string. Same as the image
+                // block above.
+                if (cbor_value_is_tag(&value))
+                    cbor_value_advance(&value);
                 cbor_value_advance(&value);
+            }
             return true;
         } catch (const JFJochException &e) {
             throw JFJochException(JFJochExceptionCategory::CBORError,
diff --git a/frontend/src/client/types.gen.ts b/frontend/src/client/types.gen.ts
index 460d6004..63347682 100644
--- a/frontend/src/client/types.gen.ts
+++ b/frontend/src/client/types.gen.ts
@@ -718,9 +718,11 @@ export type spot_finding_settings = {
      */
     high_resolution_limit?: number;
     /**
-     * Low resolution limit for spot finding [Angstrom]
+     * Low resolution limit for spot finding [Angstrom]. Optional: if omitted, spot finding is not
+     * clipped at the low-resolution end. A value of 0 is accepted and means the same thing.
+     *
      */
-    low_resolution_limit: number;
+    low_resolution_limit?: number;
     /**
      * High resolution threshold to consider spot "low resolution" [Angstrom]
      */
diff --git a/frontend/src/client/zod.gen.ts b/frontend/src/client/zod.gen.ts
index 13b1a2e5..d9a28c64 100644
--- a/frontend/src/client/zod.gen.ts
+++ b/frontend/src/client/zod.gen.ts
@@ -301,7 +301,7 @@ export const zSpotFindingSettings = z.object({
     min_pix_per_spot: z.coerce.bigint().gte(BigInt(1)).max(BigInt('9223372036854775807'), { error: 'Invalid value: Expected int64 to be <= 9223372036854775807' }),
     max_pix_per_spot: z.coerce.bigint().gte(BigInt(1)).max(BigInt('9223372036854775807'), { error: 'Invalid value: Expected int64 to be <= 9223372036854775807' }),
     high_resolution_limit: z.number().optional(),
-    low_resolution_limit: z.number(),
+    low_resolution_limit: z.number().optional(),
     high_resolution_limit_for_spot_count_low_res: z.number().gte(2).lte(8),
     quick_integration: z.boolean().default(false),
     ice_ring_width_q_recipA: z.number().gte(0).lte(1).default(0.03),
diff --git a/image_analysis/MXAnalysisWithoutFPGA.cpp b/image_analysis/MXAnalysisWithoutFPGA.cpp
index 8445fd4a..3cbf1ba5 100644
--- a/image_analysis/MXAnalysisWithoutFPGA.cpp
+++ b/image_analysis/MXAnalysisWithoutFPGA.cpp
@@ -331,12 +331,14 @@ void MXAnalysisWithoutFPGA::RunROIOnly(DataMessage &output) {
 void MXAnalysisWithoutFPGA::UpdateMaskResolution(const SpotFindingSettings &settings) {
     mask_low_res = settings.low_resolution_limit;
     mask_high_res = settings.high_resolution_limit;
-    // No high-resolution limit requested -> mask nothing at the high-resolution end: no pixel has d < 0,
-    // and the detector's own edge is where the pixels stop anyway.
+    // An unset limit masks nothing at that end. At the high-resolution end 0 does that on its own - no
+    // pixel has d < 0, and the detector's own edge is where the pixels stop anyway; at the low-resolution
+    // end every pixel lies above any finite stand-in, so it takes an infinite one.
     const float high_res = mask_high_res.value_or(0.0f);
+    const float low_res = mask_low_res.value_or(INFINITY);
     auto const &resolution_map = integration.Resolution();
     for (int i = 0; i < mask_resolution.size(); i++)
-        mask_resolution[i] = (resolution_map[i] > mask_low_res) || (resolution_map[i] < high_res);
+        mask_resolution[i] = (resolution_map[i] > low_res) || (resolution_map[i] < high_res);
 
     // The finders keep their own copy (the GPU ones a bit-packed device copy), so the mask is handed
     // over here - when the limits change - rather than with every image.
diff --git a/image_analysis/MXAnalysisWithoutFPGA.h b/image_analysis/MXAnalysisWithoutFPGA.h
index bb273509..58512091 100644
--- a/image_analysis/MXAnalysisWithoutFPGA.h
+++ b/image_analysis/MXAnalysisWithoutFPGA.h
@@ -61,7 +61,7 @@ class MXAnalysisWithoutFPGA {
     // The limits mask_resolution was built for. Kept as the OPTIONAL the caller passed, so an unset
     // high-resolution limit compares equal to itself and the mask is not rebuilt on every image.
     std::optional<float> mask_high_res;
-    float mask_low_res;
+    std::optional<float> mask_low_res;
     void UpdateMaskResolution(const SpotFindingSettings& settings);
 #ifdef JFJOCH_USE_CUDA
     std::shared_ptr<CudaStream> stream;   // kept so RebuildROI() can recreate the GPU ROI engine
diff --git a/image_analysis/geom_refinement/AssignSpotsToRings.cpp b/image_analysis/geom_refinement/AssignSpotsToRings.cpp
index 07dcdbf1..a53e2fd9 100644
--- a/image_analysis/geom_refinement/AssignSpotsToRings.cpp
+++ b/image_analysis/geom_refinement/AssignSpotsToRings.cpp
@@ -151,7 +151,23 @@ std::vector<RingClusters> AnalyzeClusters(const std::vector<float>& r, const std
     return ret;
 }
 
-std::vector<float> CalculateXtalRings(const UnitCell &cell, int hkl_max) {
+namespace {
+    bool reflection_present(ReflectionCondition condition, int h, int k, int l) {
+        const bool all_odd = (h % 2 != 0) && (k % 2 != 0) && (l % 2 != 0);
+        const bool all_even = (h % 2 == 0) && (k % 2 == 0) && (l % 2 == 0);
+        switch (condition) {
+            case ReflectionCondition::FaceCentred:
+                return all_odd || all_even;
+            case ReflectionCondition::Diamond:
+                return all_odd || (all_even && ((h + k + l) % 4 == 0));
+            case ReflectionCondition::All:
+            default:
+                return true;
+        }
+    }
+}
+
+std::vector<float> CalculateXtalRings(const UnitCell &cell, ReflectionCondition condition, int hkl_max) {
     CrystalLattice latt(cell);
 
     Coord Astar = latt.Astar();
@@ -159,10 +175,14 @@ std::vector<float> CalculateXtalRings(const UnitCell &cell, int hkl_max) {
     Coord Cstar = latt.Cstar();
 
     std::vector<float> u;
-    for (int h = 0; h <= hkl_max; h++) {
-        for (int k = 0; k <= hkl_max; k++) {
+    // Both signs of h and k: only for a diagonal metric does |h a* + k b*| equal |h a* - k b*|, so on a
+    // triclinic cell (silver behenate) the positive octant alone misses more rings than it finds. l stays
+    // non-negative because hkl and -h-k-l are the same ring.
+    for (int h = -hkl_max; h <= hkl_max; h++) {
+        for (int k = -hkl_max; k <= hkl_max; k++) {
             for (int l = 0; l <= hkl_max; l++) {
                 if (h == 0 && k == 0 && l == 0) continue;
+                if (!reflection_present(condition, h, k, l)) continue;
                 auto p = Astar * h + Bstar * k + Cstar * l;
                 float Q = 2.0f * PI * p.Length();
                 u.push_back(Q);
@@ -181,7 +201,7 @@ std::vector<float> CalculateXtalRings(const UnitCell &cell, int hkl_max) {
 
 
 std::vector<float> CalculateCubicXtalRings(float a, int hkl_max) {
-    return CalculateXtalRings(UnitCell(a,a,a,90,90,90), hkl_max);
+    return CalculateXtalRings(UnitCell(a,a,a,90,90,90), ReflectionCondition::All, hkl_max);
 }
 
 float GuessDetectorDistance(const DiffractionGeometry& geom, float ring_radius_pxl, float d_A) {
diff --git a/image_analysis/geom_refinement/AssignSpotsToRings.h b/image_analysis/geom_refinement/AssignSpotsToRings.h
index e2f170da..08fa6787 100644
--- a/image_analysis/geom_refinement/AssignSpotsToRings.h
+++ b/image_analysis/geom_refinement/AssignSpotsToRings.h
@@ -28,7 +28,20 @@ FindCircleCenterResult FindCircleCenter(const std::vector<SpotToSave> &v,
 
 std::vector<std::vector<int>> ClusterSpotsIntoRings(const std::vector<float>& r, float eps = 1.5, int minPts = 5);
 std::vector<RingClusters> AnalyzeClusters(const std::vector<float>& r, const std::vector<std::vector<int>> &clusters);
-std::vector<float> CalculateXtalRings(const UnitCell &cell, int hkl_max = 6);
+
+// Which hkl a lattice actually diffracts into. A cell alone does not say - the centring and any glide
+// plane do - and a ring that is systematically absent is worse than a missing one, because the fit
+// pairs the innermost OBSERVED ring with the innermost listed one. Only the conditions the calibrants
+// need are here; a cell of unknown symmetry (the viewer's "current sample") takes All.
+enum class ReflectionCondition {
+    All,          // primitive: no absences
+    FaceCentred,  // h, k, l all even or all odd
+    Diamond       // face-centred, and h + k + l = 4n when they are all even
+};
+
+std::vector<float> CalculateXtalRings(const UnitCell &cell,
+                                      ReflectionCondition condition = ReflectionCondition::All,
+                                      int hkl_max = 6);
 std::vector<float> CalculateCubicXtalRings( float a, int hkl_max = 4);
 float GuessDetectorDistance(const DiffractionGeometry& geom, float ring_radius_pxl, float d_A);
 
diff --git a/image_analysis/geom_refinement/Calibrants.cpp b/image_analysis/geom_refinement/Calibrants.cpp
index e3140200..6cdc4ce2 100644
--- a/image_analysis/geom_refinement/Calibrants.cpp
+++ b/image_analysis/geom_refinement/Calibrants.cpp
@@ -20,13 +20,15 @@ namespace {
 
 const std::vector<Calibrant> &Calibrants() {
     static const std::vector<Calibrant> table = {
+        // LaB6, Pm-3m: primitive, so every hkl is present.
         {"LaB6", UnitCell(LAB6_CELL_A, LAB6_CELL_A, LAB6_CELL_A, 90, 90, 90)},
-        // Silver behenate. T. C. Huang, H. Toraya, T. N. Blanton, Y. Wu, J. Appl. Cryst. 26 (1993), 180-184.
+        // Silver behenate, triclinic P. T. C. Huang, H. Toraya, T. N. Blanton, Y. Wu,
+        // J. Appl. Cryst. 26 (1993), 180-184.
         {"AgBh", UnitCell(5.1769, 4.7218, 58.380, 89.440, 89.634, 75.854)},
-        // CeO2, cubic fluorite, NIST SRM 674b.
-        {"CeO2", UnitCell(5.4115, 5.4115, 5.4115, 90, 90, 90)},
-        // Silicon, cubic, NIST SRM 640.
-        {"Si", UnitCell(5.43102, 5.43102, 5.43102, 90, 90, 90)},
+        // CeO2, cubic fluorite Fm-3m, NIST SRM 674b: first ring 111, not 100.
+        {"CeO2", UnitCell(5.4115, 5.4115, 5.4115, 90, 90, 90), ReflectionCondition::FaceCentred},
+        // Silicon, cubic Fd-3m, NIST SRM 640: face centring plus the diamond glide, so 222 is out too.
+        {"Si", UnitCell(5.43102, 5.43102, 5.43102, 90, 90, 90), ReflectionCondition::Diamond},
         // Hexagonal ice: measured ring positions, not a cell (see the header).
         {"ice", std::nullopt}
     };
@@ -39,7 +41,7 @@ std::vector<float> CalibrantRings(const std::string &name) {
         if (lower_case(c.name) != key)
             continue;
         if (c.cell)
-            return CalculateXtalRings(*c.cell);
+            return CalculateXtalRings(*c.cell, c.condition);
 
         std::vector<float> q;
         for (const float d : ICE_RING_RES_A)
diff --git a/image_analysis/geom_refinement/Calibrants.h b/image_analysis/geom_refinement/Calibrants.h
index faf04add..899cdae3 100644
--- a/image_analysis/geom_refinement/Calibrants.h
+++ b/image_analysis/geom_refinement/Calibrants.h
@@ -8,12 +8,16 @@
 #include <vector>
 
 #include "../../common/UnitCell.h"
+#include "AssignSpotsToRings.h"   // ReflectionCondition
 
 // The powder standards the detector geometry can be calibrated against, shared by
 // rugnux --mode=calibration and the viewer's powder-calibration panel.
 struct Calibrant {
     std::string name;                 // as offered on the command line and in the GUI (matched case-insensitively)
     std::optional<UnitCell> cell;     // unset for ice - see CalibrantRings()
+    // The cell alone does not give the rings: a centred lattice extinguishes some of them, and the
+    // innermost ring the fit starts from is the first one that is NOT extinguished.
+    ReflectionCondition condition = ReflectionCondition::All;
 };
 
 const std::vector<Calibrant> &Calibrants();
diff --git a/image_analysis/image_preprocessing/ImagePreprocessorGPU.cu b/image_analysis/image_preprocessing/ImagePreprocessorGPU.cu
index cc03a77c..426393f0 100644
--- a/image_analysis/image_preprocessing/ImagePreprocessorGPU.cu
+++ b/image_analysis/image_preprocessing/ImagePreprocessorGPU.cu
@@ -4,6 +4,14 @@
 #include <type_traits>
 
 #include "ImagePreprocessorGPU.h"
+#include "../../common/JFJochException.h"
+
+namespace {
+    void cuda_err(cudaError_t val) {
+        if (val != cudaSuccess)
+            throw JFJochException(JFJochExceptionCategory::GPUCUDAError, cudaGetErrorString(val));
+    }
+}
 
 template<class T>
 __global__ void preprocess_kernel(
@@ -237,9 +245,9 @@ ImagePreprocessorGPU::ImagePreprocessorGPU(const DiffractionExperiment &experime
     // Setup GPU settings. The current device, not device 0: workers are pinned round-robin across GPUs,
     // so device 0's SM count can belong to a different card than the one these kernels launch on.
     int device = 0;
-    cudaGetDevice(&device);
+    cuda_err(cudaGetDevice(&device));
     cudaDeviceProp prop{};
-    cudaGetDeviceProperties(&prop, device);
+    cuda_err(cudaGetDeviceProperties(&prop, device));
 
     threads = 128;
     blocks = 4 * prop.multiProcessorCount;
@@ -322,7 +330,7 @@ ImageStatistics ImagePreprocessorGPU::UntransposeAndAnalyze(ImagePreprocessorBuf
         sat_value = static_cast<T>(saturation_limit);
 
     cpu_stats[0] = ImageStatistics{.max_value = INT64_MIN, .min_value = INT64_MAX};
-    cudaMemcpyAsync(gpu_stats, cpu_stats.data(), sizeof(ImageStatistics), cudaMemcpyHostToDevice, *stream);
+    cuda_err(cudaMemcpyAsync(gpu_stats, cpu_stats.data(), sizeof(ImageStatistics), cudaMemcpyHostToDevice, *stream));
 
     // One CUDA block per bitshuffle block, plus one for the verbatim tail when there is one.
     const int nb = shuffled.nblocks + (shuffled.tail_elems > 0 ? 1 : 0);
@@ -338,12 +346,16 @@ ImageStatistics ImagePreprocessorGPU::UntransposeAndAnalyze(ImagePreprocessorBuf
         shuffled.tail_src,
         shuffled.tail_elems,
         shuffled.tail_elem0);
+    cuda_err(cudaGetLastError());
 
     if (copy_image_to_host)
-        cudaMemcpyAsync(processed_image.data(), processed_image.getGPUBuffer(), npixels * sizeof(int32_t), cudaMemcpyDeviceToHost, *stream);
-    cudaMemcpyAsync(cpu_stats.data(), gpu_stats, sizeof(ImageStatistics), cudaMemcpyDeviceToHost, *stream);
+        cuda_err(cudaMemcpyAsync(processed_image.data(), processed_image.getGPUBuffer(), npixels * sizeof(int32_t), cudaMemcpyDeviceToHost, *stream));
+    cuda_err(cudaMemcpyAsync(cpu_stats.data(), gpu_stats, sizeof(ImageStatistics), cudaMemcpyDeviceToHost, *stream));
 
-    cudaStreamSynchronize(*stream);
+    // Check the synchronise: this path decodes bytes we did not produce, and cpu_stats still holds the
+    // sentinel the host wrote above, so an unchecked failure here returns it as if it were a real
+    // measurement and the caller's fallback to the host decoder never fires.
+    cuda_err(cudaStreamSynchronize(*stream));
 
     // Only now can the device tell us whether every block actually decoded.
     bslz4_decoder->ThrowIfDecodeFailed();
@@ -365,7 +377,7 @@ ImageStatistics ImagePreprocessorGPU::Analyze(ImagePreprocessorBuffer &processed
     // On this engine's own stream, not the NULL stream: a NULL-stream copy implicitly synchronises with
     // every blocking stream in the process, which serialised all workers behind whichever one was
     // uploading. The stream is synchronised at the end of this function, so the ordering is unchanged.
-    cudaMemcpyAsync(gpu_decompressed_image, input, npixels * sizeof(T), cudaMemcpyHostToDevice, *stream);
+    cuda_err(cudaMemcpyAsync(gpu_decompressed_image, input, npixels * sizeof(T), cudaMemcpyHostToDevice, *stream));
     return AnalyzeOnDevice<T>(processed_image, err_value, sat_value);
 }
 
@@ -378,7 +390,7 @@ ImageStatistics ImagePreprocessorGPU::AnalyzeOnDevice(ImagePreprocessorBuffer &p
         sat_value = static_cast<T>(saturation_limit);
 
     cpu_stats[0] = ImageStatistics{.max_value = INT64_MIN, .min_value = INT64_MAX};
-    cudaMemcpyAsync(gpu_stats, cpu_stats.data(), sizeof(ImageStatistics), cudaMemcpyHostToDevice, *stream);
+    cuda_err(cudaMemcpyAsync(gpu_stats, cpu_stats.data(), sizeof(ImageStatistics), cudaMemcpyHostToDevice, *stream));
     preprocess_kernel<T> <<< blocks, threads, 0, *stream >>>(
         reinterpret_cast<const T *>(gpu_decompressed_image.get()),
         gpu_mask->get(),
@@ -387,13 +399,14 @@ ImageStatistics ImagePreprocessorGPU::AnalyzeOnDevice(ImagePreprocessorBuffer &p
         sat_value,
         err_value,
         npixels);
+    cuda_err(cudaGetLastError());
     // The preprocessed image is 4 bytes per pixel - by far the largest transfer here - and every GPU
     // engine reads it straight from the device buffer, so it only comes back when a CPU engine needs it.
     if (copy_image_to_host)
-        cudaMemcpyAsync(processed_image.data(), processed_image.getGPUBuffer(), npixels * sizeof(int32_t), cudaMemcpyDeviceToHost, *stream);
-    cudaMemcpyAsync(cpu_stats.data(), gpu_stats, sizeof(ImageStatistics), cudaMemcpyDeviceToHost, *stream);
+        cuda_err(cudaMemcpyAsync(processed_image.data(), processed_image.getGPUBuffer(), npixels * sizeof(int32_t), cudaMemcpyDeviceToHost, *stream));
+    cuda_err(cudaMemcpyAsync(cpu_stats.data(), gpu_stats, sizeof(ImageStatistics), cudaMemcpyDeviceToHost, *stream));
 
-    cudaStreamSynchronize(*stream);
+    cuda_err(cudaStreamSynchronize(*stream));
 
     return cpu_stats[0];
 }
diff --git a/image_analysis/scale_merge/SearchSpaceGroup.cpp b/image_analysis/scale_merge/SearchSpaceGroup.cpp
index 935df8ec..101de77a 100644
--- a/image_analysis/scale_merge/SearchSpaceGroup.cpp
+++ b/image_analysis/scale_merge/SearchSpaceGroup.cpp
@@ -736,7 +736,16 @@ SearchSpaceGroupResult SearchSpaceGroup(
             // weak axial reflection with an under-estimated sigma (fake high I/sigma) from faking a
             // screw-axis violation; it only relaxes "present", so it cannot over-call a screw whose
             // predicted-absent class carries real intensity.
-            const bool present = IoverSigma[i] > opt.present_i_over_sigma &&
+            //
+            // present_cut, not the fixed cut: merged sigma is floored at b*|I| (SigmaWithSystematicFloor),
+            // so no reflection can read I/sigma above ISa = 1/b. On a merge whose ISa sits at or below the
+            // fixed cut NOTHING is ever present - screw_violations is identically zero, so every screw axis
+            // passes unchallenged, and present_strong is zero, so the centering rescue below switches
+            // itself off on exactly the weak data it exists for. Stage A already caps the cut at the
+            // merge's own 75th percentile; reusing it here keeps the two stages on one definition. Where
+            // the fixed cut is already the smaller of the two - any merge with ISa comfortably above it -
+            // present_cut EQUALS it and this is a no-op.
+            const bool present = IoverSigma[i] > present_cut &&
                                  (opt.present_e_squared <= 0.0 || Esq[i] > opt.present_e_squared);
 
             if (CenteringAbsent(gops, hkl)) {
@@ -792,7 +801,11 @@ SearchSpaceGroupResult SearchSpaceGroup(
         for (const auto& a : screw_absent_refl) {
             const auto it = row_median.find(a.row);
             const double row_scale = it == row_median.end() ? 1.0 : std::max(1.0, it->second);
-            if (a.i_over_sigma > opt.present_i_over_sigma &&
+            // present_cut for the same reason as the general "present" above - with the fixed cut this
+            // test cannot fire at all on a low-ISa merge. The row-relative E^2 gate is the other half of
+            // the test and is unchanged, so an absence still has to look strong against its OWN axial row
+            // to count as a violation.
+            if (a.i_over_sigma > present_cut &&
                 (opt.present_e_squared <= 0.0 || a.e_squared > opt.present_e_squared * row_scale))
                 ++screw_violations;
             screw_absent_esq.push_back(a.e_squared);
diff --git a/image_analysis/spot_finding/DetModuleSpotFinder_cpu.h b/image_analysis/spot_finding/DetModuleSpotFinder_cpu.h
index e0edbf2a..d560aef4 100644
--- a/image_analysis/spot_finding/DetModuleSpotFinder_cpu.h
+++ b/image_analysis/spot_finding/DetModuleSpotFinder_cpu.h
@@ -39,8 +39,9 @@ void FindSpots(DeviceOutput &output,
                 || (col == 767) || (col == 768))
                 bad_pixel = 1;
 
+            // An unset limit masks nothing at that end (see MXAnalysisWithoutFPGA::UpdateMaskResolution).
             if ((d_array[coord] < settings.high_resolution_limit.value_or(0.0f))
-                || (d_array[coord] > settings.low_resolution_limit))
+                || (d_array[coord] > settings.low_resolution_limit.value_or(INFINITY)))
                 bad_pixel = 1;
 
             if ((std::is_signed<Tpixel>::value
diff --git a/image_analysis/spot_finding/SpotExtractorGPU.cu b/image_analysis/spot_finding/SpotExtractorGPU.cu
index ec40d6cb..2a5e9c38 100644
--- a/image_analysis/spot_finding/SpotExtractorGPU.cu
+++ b/image_analysis/spot_finding/SpotExtractorGPU.cu
@@ -1,10 +1,16 @@
 // SPDX-FileCopyrightText: 2026 Filip Leonarski, Paul Scherrer Institute <filip.leonarski@psi.ch>
 // SPDX-License-Identifier: GPL-3.0-only
 
-// Sparse connected-component labelling adapted from the design the ACTS/traccc project arrived at
-// for sparse silicon-detector clusterization (backward-neighbour graph over a sorted hit list, then
-// a parallel union-find), which is itself the GPU counterpart of the SparseCCL that
-// StrongPixelSet.cpp uses on the host.
+// Sparse connected-component labelling following the design the ACTS/traccc project arrived at for
+// sparse silicon-detector clusterization (backward-neighbour graph over a sorted hit list, then a
+// parallel union-find), which is itself the GPU counterpart of the SparseCCL that
+// StrongPixelSet.cpp adapts on the host.
+//   https://github.com/acts-project/traccc
+//   (c) 2021-2025 CERN for the benefit of the ACTS project
+//   Mozilla Public License Version 2.0
+// The kernels below are this project's own - the algorithm is traccc's. Cited in
+// docs/ACKNOWLEDGEMENT.md: P. Gessinger et al., "traccc: GPU track reconstruction library for HEP
+// experiments" (2025), arXiv:2505.22822.
 
 #include <climits>
 
diff --git a/image_analysis/spot_finding/SpotFindingSettings.h b/image_analysis/spot_finding/SpotFindingSettings.h
index 76cff2b0..5ecc300d 100644
--- a/image_analysis/spot_finding/SpotFindingSettings.h
+++ b/image_analysis/spot_finding/SpotFindingSettings.h
@@ -20,7 +20,12 @@ struct SpotFindingSettings {
     // resolution clipping of the detection at all (DiffractionExperiment::GetDetectorMaxResolution_A
     // supplies the number where one is needed, e.g. for the spot plot's shells).
     std::optional<float> high_resolution_limit;
-    float low_resolution_limit = 50.0;
+    // Low-resolution limit for spot finding [A]. std::nullopt = no limit at the low-resolution end, the
+    // mirror of high_resolution_limit above. Optional rather than a zero sentinel because zero is not a
+    // natural "no limit" here: every pixel has d above it, so the plain comparison would mask the whole
+    // image rather than none of it. Defaults to a concrete value, which is where the detection normally
+    // stops - the direct beam and its halo sit beyond it.
+    std::optional<float> low_resolution_limit = 50.0;
     float cutoff_spot_count_low_res = 5.0;
     std::optional<float> high_res_gap_Q_recipA = 1.5; // 0.25 * 2 * pi
 
diff --git a/licenses/COLLECT.sh b/licenses/COLLECT.sh
index 466ae701..5ab25fd1 100644
--- a/licenses/COLLECT.sh
+++ b/licenses/COLLECT.sh
@@ -78,4 +78,4 @@ copy_license Qt6-LGPL-3.0.txt /usr/share/common-licenses/LGPL-3
 copy_license NVIDIA-CUDA-EULA.txt \
     /usr/local/cuda/EULA.txt /usr/local/cuda-12.8/EULA.txt
 
-echo "Done. base64-macaron.txt, Qt6-NOTICE.txt and NVIDIA-CUDA-NOTICE.txt are maintained by hand."
+echo "Done. base64-macaron.txt, traccc.txt, Qt6-NOTICE.txt and NVIDIA-CUDA-NOTICE.txt are maintained by hand."
diff --git a/licenses/traccc.txt b/licenses/traccc.txt
new file mode 100644
index 00000000..14e2f777
--- /dev/null
+++ b/licenses/traccc.txt
@@ -0,0 +1,373 @@
+Mozilla Public License Version 2.0
+==================================
+
+1. Definitions
+--------------
+
+1.1. "Contributor"
+    means each individual or legal entity that creates, contributes to
+    the creation of, or owns Covered Software.
+
+1.2. "Contributor Version"
+    means the combination of the Contributions of others (if any) used
+    by a Contributor and that particular Contributor's Contribution.
+
+1.3. "Contribution"
+    means Covered Software of a particular Contributor.
+
+1.4. "Covered Software"
+    means Source Code Form to which the initial Contributor has attached
+    the notice in Exhibit A, the Executable Form of such Source Code
+    Form, and Modifications of such Source Code Form, in each case
+    including portions thereof.
+
+1.5. "Incompatible With Secondary Licenses"
+    means
+
+    (a) that the initial Contributor has attached the notice described
+        in Exhibit B to the Covered Software; or
+
+    (b) that the Covered Software was made available under the terms of
+        version 1.1 or earlier of the License, but not also under the
+        terms of a Secondary License.
+
+1.6. "Executable Form"
+    means any form of the work other than Source Code Form.
+
+1.7. "Larger Work"
+    means a work that combines Covered Software with other material, in 
+    a separate file or files, that is not Covered Software.
+
+1.8. "License"
+    means this document.
+
+1.9. "Licensable"
+    means having the right to grant, to the maximum extent possible,
+    whether at the time of the initial grant or subsequently, any and
+    all of the rights conveyed by this License.
+
+1.10. "Modifications"
+    means any of the following:
+
+    (a) any file in Source Code Form that results from an addition to,
+        deletion from, or modification of the contents of Covered
+        Software; or
+
+    (b) any new file in Source Code Form that contains any Covered
+        Software.
+
+1.11. "Patent Claims" of a Contributor
+    means any patent claim(s), including without limitation, method,
+    process, and apparatus claims, in any patent Licensable by such
+    Contributor that would be infringed, but for the grant of the
+    License, by the making, using, selling, offering for sale, having
+    made, import, or transfer of either its Contributions or its
+    Contributor Version.
+
+1.12. "Secondary License"
+    means either the GNU General Public License, Version 2.0, the GNU
+    Lesser General Public License, Version 2.1, the GNU Affero General
+    Public License, Version 3.0, or any later versions of those
+    licenses.
+
+1.13. "Source Code Form"
+    means the form of the work preferred for making modifications.
+
+1.14. "You" (or "Your")
+    means an individual or a legal entity exercising rights under this
+    License. For legal entities, "You" includes any entity that
+    controls, is controlled by, or is under common control with You. For
+    purposes of this definition, "control" means (a) the power, direct
+    or indirect, to cause the direction or management of such entity,
+    whether by contract or otherwise, or (b) ownership of more than
+    fifty percent (50%) of the outstanding shares or beneficial
+    ownership of such entity.
+
+2. License Grants and Conditions
+--------------------------------
+
+2.1. Grants
+
+Each Contributor hereby grants You a world-wide, royalty-free,
+non-exclusive license:
+
+(a) under intellectual property rights (other than patent or trademark)
+    Licensable by such Contributor to use, reproduce, make available,
+    modify, display, perform, distribute, and otherwise exploit its
+    Contributions, either on an unmodified basis, with Modifications, or
+    as part of a Larger Work; and
+
+(b) under Patent Claims of such Contributor to make, use, sell, offer
+    for sale, have made, import, and otherwise transfer either its
+    Contributions or its Contributor Version.
+
+2.2. Effective Date
+
+The licenses granted in Section 2.1 with respect to any Contribution
+become effective for each Contribution on the date the Contributor first
+distributes such Contribution.
+
+2.3. Limitations on Grant Scope
+
+The licenses granted in this Section 2 are the only rights granted under
+this License. No additional rights or licenses will be implied from the
+distribution or licensing of Covered Software under this License.
+Notwithstanding Section 2.1(b) above, no patent license is granted by a
+Contributor:
+
+(a) for any code that a Contributor has removed from Covered Software;
+    or
+
+(b) for infringements caused by: (i) Your and any other third party's
+    modifications of Covered Software, or (ii) the combination of its
+    Contributions with other software (except as part of its Contributor
+    Version); or
+
+(c) under Patent Claims infringed by Covered Software in the absence of
+    its Contributions.
+
+This License does not grant any rights in the trademarks, service marks,
+or logos of any Contributor (except as may be necessary to comply with
+the notice requirements in Section 3.4).
+
+2.4. Subsequent Licenses
+
+No Contributor makes additional grants as a result of Your choice to
+distribute the Covered Software under a subsequent version of this
+License (see Section 10.2) or under the terms of a Secondary License (if
+permitted under the terms of Section 3.3).
+
+2.5. Representation
+
+Each Contributor represents that the Contributor believes its
+Contributions are its original creation(s) or it has sufficient rights
+to grant the rights to its Contributions conveyed by this License.
+
+2.6. Fair Use
+
+This License is not intended to limit any rights You have under
+applicable copyright doctrines of fair use, fair dealing, or other
+equivalents.
+
+2.7. Conditions
+
+Sections 3.1, 3.2, 3.3, and 3.4 are conditions of the licenses granted
+in Section 2.1.
+
+3. Responsibilities
+-------------------
+
+3.1. Distribution of Source Form
+
+All distribution of Covered Software in Source Code Form, including any
+Modifications that You create or to which You contribute, must be under
+the terms of this License. You must inform recipients that the Source
+Code Form of the Covered Software is governed by the terms of this
+License, and how they can obtain a copy of this License. You may not
+attempt to alter or restrict the recipients' rights in the Source Code
+Form.
+
+3.2. Distribution of Executable Form
+
+If You distribute Covered Software in Executable Form then:
+
+(a) such Covered Software must also be made available in Source Code
+    Form, as described in Section 3.1, and You must inform recipients of
+    the Executable Form how they can obtain a copy of such Source Code
+    Form by reasonable means in a timely manner, at a charge no more
+    than the cost of distribution to the recipient; and
+
+(b) You may distribute such Executable Form under the terms of this
+    License, or sublicense it under different terms, provided that the
+    license for the Executable Form does not attempt to limit or alter
+    the recipients' rights in the Source Code Form under this License.
+
+3.3. Distribution of a Larger Work
+
+You may create and distribute a Larger Work under terms of Your choice,
+provided that You also comply with the requirements of this License for
+the Covered Software. If the Larger Work is a combination of Covered
+Software with a work governed by one or more Secondary Licenses, and the
+Covered Software is not Incompatible With Secondary Licenses, this
+License permits You to additionally distribute such Covered Software
+under the terms of such Secondary License(s), so that the recipient of
+the Larger Work may, at their option, further distribute the Covered
+Software under the terms of either this License or such Secondary
+License(s).
+
+3.4. Notices
+
+You may not remove or alter the substance of any license notices
+(including copyright notices, patent notices, disclaimers of warranty,
+or limitations of liability) contained within the Source Code Form of
+the Covered Software, except that You may alter any license notices to
+the extent required to remedy known factual inaccuracies.
+
+3.5. Application of Additional Terms
+
+You may choose to offer, and to charge a fee for, warranty, support,
+indemnity or liability obligations to one or more recipients of Covered
+Software. However, You may do so only on Your own behalf, and not on
+behalf of any Contributor. You must make it absolutely clear that any
+such warranty, support, indemnity, or liability obligation is offered by
+You alone, and You hereby agree to indemnify every Contributor for any
+liability incurred by such Contributor as a result of warranty, support,
+indemnity or liability terms You offer. You may include additional
+disclaimers of warranty and limitations of liability specific to any
+jurisdiction.
+
+4. Inability to Comply Due to Statute or Regulation
+---------------------------------------------------
+
+If it is impossible for You to comply with any of the terms of this
+License with respect to some or all of the Covered Software due to
+statute, judicial order, or regulation then You must: (a) comply with
+the terms of this License to the maximum extent possible; and (b)
+describe the limitations and the code they affect. Such description must
+be placed in a text file included with all distributions of the Covered
+Software under this License. Except to the extent prohibited by statute
+or regulation, such description must be sufficiently detailed for a
+recipient of ordinary skill to be able to understand it.
+
+5. Termination
+--------------
+
+5.1. The rights granted under this License will terminate automatically
+if You fail to comply with any of its terms. However, if You become
+compliant, then the rights granted under this License from a particular
+Contributor are reinstated (a) provisionally, unless and until such
+Contributor explicitly and finally terminates Your grants, and (b) on an
+ongoing basis, if such Contributor fails to notify You of the
+non-compliance by some reasonable means prior to 60 days after You have
+come back into compliance. Moreover, Your grants from a particular
+Contributor are reinstated on an ongoing basis if such Contributor
+notifies You of the non-compliance by some reasonable means, this is the
+first time You have received notice of non-compliance with this License
+from such Contributor, and You become compliant prior to 30 days after
+Your receipt of the notice.
+
+5.2. If You initiate litigation against any entity by asserting a patent
+infringement claim (excluding declaratory judgment actions,
+counter-claims, and cross-claims) alleging that a Contributor Version
+directly or indirectly infringes any patent, then the rights granted to
+You by any and all Contributors for the Covered Software under Section
+2.1 of this License shall terminate.
+
+5.3. In the event of termination under Sections 5.1 or 5.2 above, all
+end user license agreements (excluding distributors and resellers) which
+have been validly granted by You or Your distributors under this License
+prior to termination shall survive termination.
+
+************************************************************************
+*                                                                      *
+*  6. Disclaimer of Warranty                                           *
+*  -------------------------                                           *
+*                                                                      *
+*  Covered Software is provided under this License on an "as is"       *
+*  basis, without warranty of any kind, either expressed, implied, or  *
+*  statutory, including, without limitation, warranties that the       *
+*  Covered Software is free of defects, merchantable, fit for a        *
+*  particular purpose or non-infringing. The entire risk as to the     *
+*  quality and performance of the Covered Software is with You.        *
+*  Should any Covered Software prove defective in any respect, You     *
+*  (not any Contributor) assume the cost of any necessary servicing,   *
+*  repair, or correction. This disclaimer of warranty constitutes an   *
+*  essential part of this License. No use of any Covered Software is   *
+*  authorized under this License except under this disclaimer.         *
+*                                                                      *
+************************************************************************
+
+************************************************************************
+*                                                                      *
+*  7. Limitation of Liability                                          *
+*  --------------------------                                          *
+*                                                                      *
+*  Under no circumstances and under no legal theory, whether tort      *
+*  (including negligence), contract, or otherwise, shall any           *
+*  Contributor, or anyone who distributes Covered Software as          *
+*  permitted above, be liable to You for any direct, indirect,         *
+*  special, incidental, or consequential damages of any character      *
+*  including, without limitation, damages for lost profits, loss of    *
+*  goodwill, work stoppage, computer failure or malfunction, or any    *
+*  and all other commercial damages or losses, even if such party      *
+*  shall have been informed of the possibility of such damages. This   *
+*  limitation of liability shall not apply to liability for death or   *
+*  personal injury resulting from such party's negligence to the       *
+*  extent applicable law prohibits such limitation. Some               *
+*  jurisdictions do not allow the exclusion or limitation of           *
+*  incidental or consequential damages, so this exclusion and          *
+*  limitation may not apply to You.                                    *
+*                                                                      *
+************************************************************************
+
+8. Litigation
+-------------
+
+Any litigation relating to this License may be brought only in the
+courts of a jurisdiction where the defendant maintains its principal
+place of business and such litigation shall be governed by laws of that
+jurisdiction, without reference to its conflict-of-law provisions.
+Nothing in this Section shall prevent a party's ability to bring
+cross-claims or counter-claims.
+
+9. Miscellaneous
+----------------
+
+This License represents the complete agreement concerning the subject
+matter hereof. If any provision of this License is held to be
+unenforceable, such provision shall be reformed only to the extent
+necessary to make it enforceable. Any law or regulation which provides
+that the language of a contract shall be construed against the drafter
+shall not be used to construe this License against a Contributor.
+
+10. Versions of the License
+---------------------------
+
+10.1. New Versions
+
+Mozilla Foundation is the license steward. Except as provided in Section
+10.3, no one other than the license steward has the right to modify or
+publish new versions of this License. Each version will be given a
+distinguishing version number.
+
+10.2. Effect of New Versions
+
+You may distribute the Covered Software under the terms of the version
+of the License under which You originally received the Covered Software,
+or under the terms of any subsequent version published by the license
+steward.
+
+10.3. Modified Versions
+
+If you create software not governed by this License, and you want to
+create a new license for such software, you may create and use a
+modified version of this License if you rename the license and remove
+any references to the name of the license steward (except to note that
+such modified license differs from this License).
+
+10.4. Distributing Source Code Form that is Incompatible With Secondary
+Licenses
+
+If You choose to distribute Source Code Form that is Incompatible With
+Secondary Licenses under the terms of this version of the License, the
+notice described in Exhibit B of this License must be attached.
+
+Exhibit A - Source Code Form License Notice
+-------------------------------------------
+
+  This Source Code Form is subject to the terms of the Mozilla Public
+  License, v. 2.0. If a copy of the MPL was not distributed with this
+  file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+If it is not possible or desirable to put the notice in a particular
+file, then You may include the notice in a location (such as a LICENSE
+file in a relevant directory) where a recipient would be likely to look
+for such a notice.
+
+You may add additional accurate notices of copyright ownership.
+
+Exhibit B - "Incompatible With Secondary Licenses" Notice
+---------------------------------------------------------
+
+  This Source Code Form is "Incompatible With Secondary Licenses", as
+  defined by the Mozilla Public License, v. 2.0.
diff --git a/reader/HDF5ImageLocator.cpp b/reader/HDF5ImageLocator.cpp
index 5132a904..df62d7e2 100644
--- a/reader/HDF5ImageLocator.cpp
+++ b/reader/HDF5ImageLocator.cpp
@@ -86,13 +86,21 @@ HDF5ImageLocator::Location HDF5ImageLocator::Resolve(int64_t global_image) const
 
 std::vector<HDF5DataSourceMessage> HDF5ImageLocator::GetSourceMapping(uint64_t first_image,
                                                                       std::optional<uint64_t> image_count,
-                                                                      uint64_t total_images) const {
+                                                                      uint64_t total_images,
+                                                                      uint64_t stride) const {
+    if (stride == 0)
+        throw JFJochException(JFJochExceptionCategory::InputParameterInvalid,
+                              "Image stride cannot be zero");
+
     if (first_image > total_images)
         throw JFJochException(JFJochExceptionCategory::InputParameterInvalid,
                               "First image outside dataset range");
 
-    const uint64_t requested_count = image_count.value_or(total_images - first_image);
-    if (first_image + requested_count > total_images)
+    // With a stride the caller's count is the number of OUTPUT images, which spans
+    // (count - 1) * stride + 1 source images - not count of them.
+    const uint64_t requested_count =
+        image_count.value_or((total_images - first_image + stride - 1) / stride);
+    if (requested_count > 0 && first_image + (requested_count - 1) * stride >= total_images)
         throw JFJochException(JFJochExceptionCategory::InputParameterInvalid,
                               "Requested image range outside dataset range");
 
@@ -102,15 +110,18 @@ std::vector<HDF5DataSourceMessage> HDF5ImageLocator::GetSourceMapping(uint64_t f
 
     // Integrated / contiguous source: link directly to the original master file.
     if (layout_.format == FileWriterFormat::NXmxVDS && layout_.data_layout != HDF5DataSetLayout::VIRTUAL) {
-        AppendOrExtendSourceMapping(ret, layout_.master_filename, "/entry/data/data",
-                                    first_image, 0, requested_count);
+        // One extendable run when the images are consecutive; strided output needs one mapping per image,
+        // which AppendOrExtendSourceMapping leaves separate because the source indices are not adjacent.
+        for (uint64_t local_image = 0; local_image < requested_count; ++local_image)
+            AppendOrExtendSourceMapping(ret, layout_.master_filename, "/entry/data/data",
+                                        first_image + local_image * stride, local_image, 1);
         return ret;
     }
 
     // VDS source: expand VDS mappings to original source files, not to the VDS master.
     if (layout_.format == FileWriterFormat::NXmxVDS && layout_.data_layout == HDF5DataSetLayout::VIRTUAL) {
         for (uint64_t local_image = 0; local_image < requested_count; ++local_image) {
-            const hsize_t virtual_image = first_image + local_image;
+            const hsize_t virtual_image = first_image + local_image * stride;
 
             bool found = false;
             for (const auto &mapping: layout_.vds_mappings) {
@@ -140,7 +151,7 @@ std::vector<HDF5DataSourceMessage> HDF5ImageLocator::GetSourceMapping(uint64_t f
                                   "Cannot generate HDF5 source mapping: images_per_file is zero");
 
         for (uint64_t local_image = 0; local_image < requested_count; ++local_image) {
-            const uint64_t source_global_image = first_image + local_image;
+            const uint64_t source_global_image = first_image + local_image * stride;
             const uint64_t file_id = source_global_image / layout_.images_per_file;
             const uint64_t source_image = source_global_image % layout_.images_per_file;
 
diff --git a/reader/HDF5ImageLocator.h b/reader/HDF5ImageLocator.h
index de69ae2b..c91e5a69 100644
--- a/reader/HDF5ImageLocator.h
+++ b/reader/HDF5ImageLocator.h
@@ -49,9 +49,14 @@ public:
 
     // Source mapping for re-writing a derived file (e.g. _process.h5) so it links back to the
     // original pixel sources rather than to a master. total_images is supplied by the caller.
+    // stride is the step between consecutive images of the derived file in the SOURCE: image i of the
+    // output comes from source image first_image + i * stride. It has to match the stride the caller
+    // processed with, or the pictures and the per-image analysis in the derived file describe
+    // different frames.
     std::vector<HDF5DataSourceMessage> GetSourceMapping(uint64_t first_image,
                                                         std::optional<uint64_t> image_count,
-                                                        uint64_t total_images) const;
+                                                        uint64_t total_images,
+                                                        uint64_t stride = 1) const;
 
 private:
     Layout layout_;
diff --git a/reader/HDF5ImageSource.cpp b/reader/HDF5ImageSource.cpp
index 42464817..fe624134 100644
--- a/reader/HDF5ImageSource.cpp
+++ b/reader/HDF5ImageSource.cpp
@@ -18,8 +18,9 @@ HDF5ImageLocator::Location HDF5ImageSource::Resolve(int64_t global) const {
 
 std::vector<HDF5DataSourceMessage> HDF5ImageSource::GetSourceMapping(uint64_t first_image,
                                                                      std::optional<uint64_t> image_count,
-                                                                     uint64_t total_images) const {
-    return locator_.GetSourceMapping(first_image, image_count, total_images);
+                                                                     uint64_t total_images,
+                                                                     uint64_t stride) const {
+    return locator_.GetSourceMapping(first_image, image_count, total_images, stride);
 }
 
 CompressedImage HDF5ImageSource::ReadImageAt(std::vector<uint8_t> &buffer,
diff --git a/reader/HDF5ImageSource.h b/reader/HDF5ImageSource.h
index ac45020c..8b1a9176 100644
--- a/reader/HDF5ImageSource.h
+++ b/reader/HDF5ImageSource.h
@@ -28,7 +28,8 @@ public:
 
     std::vector<HDF5DataSourceMessage> GetSourceMapping(uint64_t first_image,
                                                         std::optional<uint64_t> image_count,
-                                                        uint64_t total_images) const;
+                                                        uint64_t total_images,
+                                                        uint64_t stride = 1) const;
 
 private:
     HDF5ImageLocator locator_;
diff --git a/reader/JFJochHDF5Reader.cpp b/reader/JFJochHDF5Reader.cpp
index ba8c879a..953d130b 100644
--- a/reader/JFJochHDF5Reader.cpp
+++ b/reader/JFJochHDF5Reader.cpp
@@ -92,14 +92,15 @@ bool JFJochHDF5Reader::LoadImage_i(std::shared_ptr<JFJochReaderDataset> &dataset
 }
 
 std::vector<HDF5DataSourceMessage> JFJochHDF5Reader::GetHDF5DataSource(uint64_t first_image,
-                                                                       std::optional<uint64_t> image_count) const {
+                                                                       std::optional<uint64_t> image_count,
+                                                                       uint64_t stride) const {
     std::unique_lock ul(hdf5_mutex);
 
     if (!active_metadata_)
         throw JFJochException(JFJochExceptionCategory::InputParameterInvalid,
                               "Cannot generate HDF5 source mapping if file not loaded");
 
-    return image_source_.GetSourceMapping(first_image, image_count, number_of_images);
+    return image_source_.GetSourceMapping(first_image, image_count, number_of_images, stride);
 }
 
 std::vector<IntegrationOutcome> JFJochHDF5Reader::ReadReflections(size_t start_image,
diff --git a/reader/JFJochHDF5Reader.h b/reader/JFJochHDF5Reader.h
index b5d51e5f..d4653e0d 100644
--- a/reader/JFJochHDF5Reader.h
+++ b/reader/JFJochHDF5Reader.h
@@ -44,9 +44,13 @@ public:
 
     void Close() override;
 
+    // stride is the step in the SOURCE between consecutive images of the derived file: image i of the
+    // output comes from source image first_image + i * stride. Pass the stride the caller processed
+    // with, or the linked pictures and the per-image analysis describe different frames.
     std::vector<HDF5DataSourceMessage> GetHDF5DataSource(
         uint64_t first_image = 0,
-        std::optional<uint64_t> image_count = {}
+        std::optional<uint64_t> image_count = {},
+        uint64_t stride = 1
     ) const;
 
     std::vector<IntegrationOutcome> ReadReflections(size_t start_image = 0, std::optional<size_t> end_image = {}) const;
diff --git a/rugnux/Rugnux.cpp b/rugnux/Rugnux.cpp
index de7116a0..d2b79e3f 100644
--- a/rugnux/Rugnux.cpp
+++ b/rugnux/Rugnux.cpp
@@ -447,7 +447,10 @@ ProcessResult Rugnux::RunPipeline(RugnuxObserver *observer, bool write_output, b
     if (end_image < 0 || end_image > total_images_in_file)
         end_image = total_images_in_file;
     const int start_image = config_.start_image;
-    const int images_to_process = (end_image - start_image) / config_.stride;
+    // Round UP: the worker loop below walks ordinals until start + ordinal * stride reaches end_image,
+    // so a stride that does not divide the range evenly still processes a final partial step. Rounding
+    // down here would size the per-image arrays one short of the ordinals that index them.
+    const int images_to_process = (end_image - start_image + config_.stride - 1) / config_.stride;
     if (images_to_process <= 0) {
         logger.Warning("No images to process (start {}, end {}, stride {}, total {})",
                        start_image, end_image, config_.stride, total_images_in_file);
@@ -525,7 +528,10 @@ ProcessResult Rugnux::RunPipeline(RugnuxObserver *observer, bool write_output, b
     start_message.file_format = FileWriterFormat::NXmxIntegrated;
     start_message.write_master_file = true;
     start_message.write_images = false;
-    start_message.hdf5_source_data = reader_.GetHDF5DataSource(start_image, images_to_process);
+    // With the stride: image i of the process file is source image start_image + i * stride, so the
+    // linked pictures line up with the per-image analysis written beside them.
+    start_message.hdf5_source_data =
+        reader_.GetHDF5DataSource(start_image, images_to_process, config_.stride);
 
     std::unique_ptr<FileWriter> writer;
     if (write_files && config_.write_process_h5)
diff --git a/rugnux/rugnux_cli.cpp b/rugnux/rugnux_cli.cpp
index febe3f4f..ee0e63d5 100644
--- a/rugnux/rugnux_cli.cpp
+++ b/rugnux/rugnux_cli.cpp
@@ -97,7 +97,7 @@ void print_usage() {
     std::cout << "   --no-adaptive-spots              Turn adaptive detection off and use the fixed --spot-threshold / --spot-sigma finder instead" << std::endl;
     std::cout << "   --spot-false-pixels <num>        Adaptive detection operating point: expected noise pixels tolerated per frame (default: 100; implies --adaptive-spots)" << std::endl;
     std::cout << "   --spot-high-resolution <num>     High resolution limit for spot finding. If omitted (or 0), spot finding is not clipped in resolution and extends as far as the detector reaches" << std::endl;
-    std::cout << "   --spot-low-resolution <num>      Low resolution limit for spot finding, in A (default: 50; lower it, e.g. 24, to exclude the direct-beam halo on weakly-diffracting serial data)" << std::endl;
+    std::cout << "   --spot-low-resolution <num>      Low resolution limit for spot finding, in A (default: 50; lower it, e.g. 24, to exclude the direct-beam halo on weakly-diffracting serial data; 0 removes the limit)" << std::endl;
     std::cout << "   --max-spots <num>                Max spot count per image, the strongest ones, handed to indexing (default: 1000)" << std::endl;
     std::cout << "   --detect-ice-rings[=on|off]      Flag ice-ring spots (de-prioritised in indexing) and exclude ice-ring reflections from scaling. Default: the master file's setting, or - where the file says nothing - on for rotation and off for stills" << std::endl;
     std::cout << std::endl;
@@ -602,7 +602,9 @@ static int RunRugnux(int argc, char **argv) {
     GeomRefinementAlgorithmEnum refinement_algorithm = GeomRefinementAlgorithmEnum::BeamCenter;
 
     std::optional<float> d_min_spot_finding;    // unset -> as far as the detector reaches
-    float d_max_spot_finding = 0;   // 0 = keep the SpotFindingSettings default (50 A)
+    // The low-resolution limit to apply: starts at the SpotFindingSettings default rather than restating
+    // it, and --spot-low-resolution 0 resets it to unset, i.e. no limit at that end.
+    std::optional<float> d_max_spot_finding = SpotFindingSettings{}.low_resolution_limit;
     std::optional<float> d_min_scale_merge;
     std::optional<ResolutionCutoffMethod> resolution_cutoff_method;   // --resolution-cutoff cc-logistic|off
     std::optional<double> resolution_cc_target;                      // --resolution-cc-target
@@ -819,10 +821,19 @@ static int RunRugnux(int argc, char **argv) {
             adaptive_spots = true;
             logger.Info("Adaptive spot detection: expected false pixels/frame set to {:.0f}", false_pixels_per_frame);
             break;
-        case OPT_SPOT_LOW_RESOLUTION:
-            d_max_spot_finding = parse_number_arg<float>(optarg, "--spot-low-resolution", logger, 0.0f);
-            logger.Info("Low resolution limit for spot finding set to {:.1f} A", d_max_spot_finding);
+        case OPT_SPOT_LOW_RESOLUTION: {
+            // Same shape as --spot-high-resolution below: 0 means "no limit at that end", expressed as
+            // the unset optional the rest of the code understands.
+            const auto d_max = parse_number_arg<float>(optarg, "--spot-low-resolution", logger, 0.0f);
+            if (d_max > 0.0f) {
+                d_max_spot_finding = d_max;
+                logger.Info("Low resolution limit for spot finding set to {:.1f} A", d_max);
+            } else {
+                d_max_spot_finding.reset();
+                logger.Info("No low resolution limit for spot finding");
+            }
             break;
+        }
         case OPT_SPOT_RESOLUTION: {
             // 0 has always meant "no limit" for this setting; keep that, but express it as the unset
             // optional the rest of the code understands. Passing the 0 through instead reached
@@ -1428,7 +1439,10 @@ static int RunRugnux(int argc, char **argv) {
         exit(EXIT_FAILURE);
     }
 
-    int images_to_process = (end_image - start_image) / image_stride;
+    // Round UP: the worker loop walks ordinals until start + ordinal * stride reaches end_image, so a
+    // stride that does not divide the range evenly still processes a final partial step. Rounding down
+    // here would size the per-image arrays one short of the ordinals that index them.
+    int images_to_process = (end_image - start_image + image_stride - 1) / image_stride;
 
     if (images_to_process <= 0) {
         logger.Warning("No images to process (Start: {}, End: {} Stride: {}, Total: {})", start_image, end_image,
@@ -1481,6 +1495,12 @@ static int RunRugnux(int argc, char **argv) {
     // --mode azint: azimuthal integration only (no spot finding / indexing / scaling). Rugnux reads
     // the geometry and azimuthal-integration settings configured above off the experiment.
     if (mode == RugnuxMode::Azint) {
+        // As for --mode calibration below: the polarization factor is a rugnux analysis default and it
+        // scales the profile this mode exists to produce, so apply the defaults and then let an explicit
+        // --polarization override them. Without this the flag was parsed and then dropped on this path.
+        ApplyRugnuxExperimentDefaults(experiment);
+        if (polarization_factor) experiment.PolarizationFactor(polarization_factor.value());
+
         ProcessConfig config;
         config.mode = ProcessMode::AzimuthalIntegration;
         config.start_image = start_image;
@@ -1541,8 +1561,7 @@ static int RunRugnux(int argc, char **argv) {
         config.spot_finding.adaptive_threshold = adaptive_spots.value_or(true);
         config.spot_finding.high_resolution_limit = d_min_spot_finding;
         config.spot_finding.false_pixels_per_frame = false_pixels_per_frame;
-        if (d_max_spot_finding > 0.0f)
-            config.spot_finding.low_resolution_limit = d_max_spot_finding;
+        config.spot_finding.low_resolution_limit = d_max_spot_finding;
         experiment.MaxSpotCount(max_spot_count_override.value_or(RUGNUX_MAX_SPOT_COUNT));
 
         logger.Info("Powder calibration: calibrant {} ({} rings), method {}, {} azimuthal bins",
@@ -1841,8 +1860,7 @@ static int RunRugnux(int argc, char **argv) {
     spot_settings.adaptive_threshold = adaptive_spots.value_or(true);
     spot_settings.high_resolution_limit = d_min_spot_finding;
     spot_settings.false_pixels_per_frame = false_pixels_per_frame;
-    if (d_max_spot_finding > 0.0f)
-        spot_settings.low_resolution_limit = d_max_spot_finding;
+    spot_settings.low_resolution_limit = d_max_spot_finding;
 
     // Validate the assembled spot-finding settings the same way the online receivers do (broker and
     // receiver call this same function). It enforces the cross-field constraints that per-argument
diff --git a/tests/CBORTest.cpp b/tests/CBORTest.cpp
index 6efb8335..b7df0480 100644
--- a/tests/CBORTest.cpp
+++ b/tests/CBORTest.cpp
@@ -7,6 +7,7 @@
 #include "../frame_serialize/CBORStream2Deserializer.h"
 #include "../compression/JFJochCompressor.h"
 #include "../frame_serialize/CborUtil.h"
+#include "../common/DiffractionExperiment.h"   // kImageMetadataHeadroom
 
 TEST_CASE("CBORSerialize_Start", "[CBOR]") {
     std::vector<uint8_t> buffer(8 * 1024 * 1024);
@@ -1027,17 +1028,19 @@ TEST_CASE("CBORSerialize_Image_Reflections") {
 TEST_CASE("CBORSerialize_Image_MetadataHeadroom", "[CBOR]") {
     // The receiver serializes the per-image CBOR metadata (spots, reflections,
     // azimuthal profile, ...) into the same buffer slot as the compressed image, and
-    // DiffractionExperiment::GetImageBufferLocationSize() reserves 4 MB of headroom
-    // on top of GetMaxCompressedSize() for it. A frame whose metadata exceeds that
-    // headroom is dropped by the receiver. This test guards that even the largest
-    // possible metadata still fits, so ordinary frames are never dropped: the
-    // kMaxReflections (10000, IndexAndRefine.cpp) reflection cap, the API maximum of
-    // 2000 spots (jfjoch_api.yaml), and the 65534-bin azimuthal cap
-    // (AzimuthalIntegrationMapping, UINT16_MAX - 1), all serialized together.
+    // DiffractionExperiment::GetImageBufferLocationSize() reserves
+    // kImageMetadataHeadroom on top of GetMaxCompressedSize() for it. A frame whose
+    // metadata exceeds that headroom is dropped by the receiver. This test guards that
+    // even the largest possible metadata still fits, so ordinary frames are never
+    // dropped: the kOnlineMaxReflections (10000, BraggPrediction.h) reflection cap, the
+    // API maximum of 2000 spots (jfjoch_api.yaml), and the 65534-bin azimuthal cap
+    // (AzimuthalIntegrationMapping, UINT16_MAX - 1), all serialized together. Take the
+    // headroom from the constant rather than restate it: written down twice, the two
+    // drifted apart and this test kept passing against the value the code had left.
     constexpr size_t max_reflections = 10000;
     constexpr size_t max_spots       = 2000;
     constexpr size_t max_az_bins     = 65534;
-    constexpr size_t headroom        = 4 * 1024 * 1024;
+    constexpr size_t headroom        = DiffractionExperiment::kImageMetadataHeadroom;
 
     std::vector<Reflection> reflections(max_reflections);
     for (size_t i = 0; i < reflections.size(); ++i)
@@ -1077,7 +1080,7 @@ TEST_CASE("CBORSerialize_Image_MetadataHeadroom", "[CBOR]") {
     REQUIRE_NOTHROW(serializer.SerializeImage(message));
 
     // GetImageAppendOffset() is where the compressed image is appended, i.e. the size
-    // of everything-but-the-image; it must stay below the 4 MB metadata headroom.
+    // of everything-but-the-image; it must stay below the metadata headroom.
     INFO("worst-case metadata size = " << serializer.GetImageAppendOffset() << " B");
     CHECK(serializer.GetImageAppendOffset() < headroom);
 }
diff --git a/tests/CalibrationTest.cpp b/tests/CalibrationTest.cpp
index 4427c0db..74231bc4 100644
--- a/tests/CalibrationTest.cpp
+++ b/tests/CalibrationTest.cpp
@@ -19,17 +19,49 @@ TEST_CASE("Calibrants_LookupIsCaseInsensitive", "[DetGeomCalib]") {
     CHECK(CalibrantRings("nonsense").empty());
 }
 
-// The innermost ring of a cubic standard is its (100), so the first q is 2*pi/a. This is what fixes
-// the distance in GuessInitialGeometry, so a wrong table would put every calibration off by that scale.
-TEST_CASE("Calibrants_CubicStandardsHaveTheirLatticeConstant", "[DetGeomCalib]") {
-    const std::map<std::string, double> a_A = {{"lab6", LAB6_CELL_A}, {"ceo2", 5.4115}, {"si", 5.43102}};
-    for (const auto &[name, a] : a_A) {
-        const auto q = CalibrantRings(name);
+// GuessInitialGeometry pairs the innermost OBSERVED ring with the first entry of this list to fix the
+// detector distance, so the first entry has to be a reflection that is really there. Only the primitive
+// standard starts at (100): both face-centred ones extinguish it and start at (111), i.e. sqrt(3) times
+// further out. Listing a forbidden ring first would scale every calibration by that ratio.
+TEST_CASE("Calibrants_FirstRingIsThePresentOne", "[DetGeomCalib]") {
+    struct Standard { std::string name; double a_A; double first_hkl_norm; };
+    // sqrt(h^2+k^2+l^2) of the innermost present reflection: LaB6 Pm-3m -> 100, CeO2 Fm-3m and Si Fd-3m -> 111.
+    const std::vector<Standard> standards = {
+        {"lab6", LAB6_CELL_A, 1.0},
+        {"ceo2", 5.4115,      std::sqrt(3.0)},
+        {"si",   5.43102,     std::sqrt(3.0)}
+    };
+    for (const auto &s : standards) {
+        const auto q = CalibrantRings(s.name);
         REQUIRE(!q.empty());
-        CHECK(q.front() == Catch::Approx(2.0 * PI / a).epsilon(1e-5));
+        CHECK(q.front() == Catch::Approx(2.0 * PI * s.first_hkl_norm / s.a_A).epsilon(1e-5));
     }
 }
 
+// The centring conditions themselves, checked ring by ring rather than only on the first one: an
+// extinct reflection anywhere in the list mis-assigns the observed rings around it.
+TEST_CASE("Calibrants_CentredStandardsOmitTheExtinctRings", "[DetGeomCalib]") {
+    auto has_ring = [](const std::vector<float> &q, double a_A, double hkl_norm) {
+        const auto want = static_cast<float>(2.0 * PI * hkl_norm / a_A);
+        return std::any_of(q.begin(), q.end(),
+                           [&](float v) { return std::fabs(v - want) < 1e-3f; });
+    };
+
+    const auto ceo2 = CalibrantRings("ceo2");
+    CHECK(has_ring(ceo2, 5.4115, std::sqrt(3.0)));    // 111 - all odd
+    CHECK(has_ring(ceo2, 5.4115, std::sqrt(4.0)));    // 200 - all even
+    CHECK(has_ring(ceo2, 5.4115, std::sqrt(12.0)));   // 222 - all even, present without a glide plane
+    CHECK_FALSE(has_ring(ceo2, 5.4115, 1.0));         // 100 - mixed parity
+    CHECK_FALSE(has_ring(ceo2, 5.4115, std::sqrt(2.0)));  // 110 - mixed parity
+
+    const auto si = CalibrantRings("si");
+    CHECK(has_ring(si, 5.43102, std::sqrt(3.0)));     // 111 - all odd
+    CHECK(has_ring(si, 5.43102, std::sqrt(8.0)));     // 220 - all even, h+k+l = 4n
+    CHECK_FALSE(has_ring(si, 5.43102, 1.0));          // 100 - mixed parity
+    CHECK_FALSE(has_ring(si, 5.43102, std::sqrt(4.0)));   // 200 - all even, h+k+l = 2
+    CHECK_FALSE(has_ring(si, 5.43102, std::sqrt(12.0)));  // 222 - the diamond glide takes it out
+}
+
 // Ice is the reason the calibrant abstraction is a ring list and not a UnitCell: its entries are
 // measured ring positions, and enumerating hkl from the hexagonal cell would add rings that are
 // systematically absent in P6_3/mmc.
diff --git a/tests/JFJochReaderTest.cpp b/tests/JFJochReaderTest.cpp
index bf84b6ba..243ce349 100644
--- a/tests/JFJochReaderTest.cpp
+++ b/tests/JFJochReaderTest.cpp
@@ -2069,6 +2069,124 @@ TEST_CASE("JFJochReader_ProcessingHDF5_FromVDS_MapsToDataFiles", "[HDF5][Full]")
     REQUIRE(H5Fget_obj_count(H5F_OBJ_ALL, H5F_OBJ_ALL) == 0);
 }
 
+// rugnux --stride N processes every Nth image, so image i of the _process.h5 IS source image
+// start + i*N. The mapping used to be built without the stride, linking the first N images instead,
+// which put each frame's picture next to a different frame's analysis. Read the pixels back through
+// the written VDS rather than only inspecting the mapping: that is what a user opening the file sees.
+TEST_CASE("JFJochReader_ProcessingHDF5_Strided_LinksTheProcessedImages", "[HDF5][Full]") {
+    DiffractionExperiment x(DetJF(1));
+
+    x.FilePrefix("proc_stride_src").ImagesPerTrigger(10).ImagesPerFile(2).OverwriteExistingFiles(true);
+    x.BitDepthImage(16).SetFileWriterFormat(FileWriterFormat::NXmxVDS).PixelSigned(true);
+    x.Compression(CompressionAlgorithm::NO_COMPRESSION);
+
+    std::vector<int16_t> image(x.GetPixelsNum(), 51);
+
+    RegisterHDF5Filter();
+    {
+        StartMessage start_message;
+        x.FillMessage(start_message);
+        FileWriter writer(start_message);
+
+        for (int i = 0; i < x.GetImageNum(); i++) {
+            image[5678] = static_cast<int16_t>(500 + i);   // per-image tag: which source frame is this?
+
+            DataMessage message{};
+            message.image = CompressedImage(image, x.GetXPixelsNum(), x.GetYPixelsNum());
+            message.number = i;
+            REQUIRE_NOTHROW(writer.WriteHDF5(message));
+        }
+
+        EndMessage end_message;
+        end_message.max_image_number = x.GetImageNum();
+        writer.WriteHDF5(end_message);
+        writer.Finalize();
+    }
+
+    // start 1, 3 images, stride 3 -> source images 1, 4, 7. Two images per data file, so those sit in
+    // data_000001 (holds 0,1), data_000003 (holds 4,5) and data_000004 (holds 6,7).
+    std::vector<HDF5DataSourceMessage> source_data;
+    {
+        JFJochHDF5Reader reader;
+        REQUIRE_NOTHROW(reader.ReadFile("proc_stride_src_master.h5"));
+        source_data = reader.GetHDF5DataSource(1, 3, 3);
+
+        // Non-adjacent source images cannot be merged into one run, so one mapping per image.
+        REQUIRE(source_data.size() == 3);
+
+        CHECK(source_data[0].filename == "proc_stride_src_data_000001.h5");
+        CHECK(source_data[0].source_first_image == 1);
+        CHECK(source_data[0].virtual_first_image == 0);
+        CHECK(source_data[0].image_count == 1);
+
+        CHECK(source_data[1].filename == "proc_stride_src_data_000003.h5");
+        CHECK(source_data[1].source_first_image == 0);
+        CHECK(source_data[1].virtual_first_image == 1);
+        CHECK(source_data[1].image_count == 1);
+
+        CHECK(source_data[2].filename == "proc_stride_src_data_000004.h5");
+        CHECK(source_data[2].source_first_image == 1);
+        CHECK(source_data[2].virtual_first_image == 2);
+        CHECK(source_data[2].image_count == 1);
+    }
+
+    {
+        DiffractionExperiment proc_x = x;
+        proc_x.FilePrefix("proc_from_stride")
+              .ImagesPerTrigger(3)
+              .SetFileWriterFormat(FileWriterFormat::NXmxIntegrated)
+              .OverwriteExistingFiles(true);
+
+        StartMessage start_message;
+        proc_x.FillMessage(start_message);
+        start_message.number_of_images = 3;
+        start_message.images_per_file = 3;
+        start_message.write_images = false;
+        start_message.write_master_file = true;
+        start_message.hdf5_source_data = source_data;
+
+        FileWriter writer(start_message);
+
+        for (int i = 0; i < 3; i++) {
+            DataMessage message{};
+            message.number = i;
+            message.original_number = 1 + i * 3;
+            message.image = CompressedImage(image, x.GetXPixelsNum(), x.GetYPixelsNum());
+            message.spot_count = 200 + i;
+            REQUIRE_NOTHROW(writer.WriteHDF5(message));
+        }
+
+        EndMessage end_message;
+        end_message.max_image_number = 3;
+        writer.WriteHDF5(end_message);
+        writer.Finalize();
+    }
+
+    {
+        JFJochHDF5Reader reader;
+        REQUIRE_NOTHROW(reader.ReadFile("proc_from_stride_master.h5"));
+
+        // The whole point: frame i of the process file carries source frame 1 + 3i, not 1 + i.
+        auto img0 = reader.LoadImage(0);
+        REQUIRE(img0);
+        CHECK(img0->Image()[5678] == 501);
+
+        auto img1 = reader.LoadImage(1);
+        REQUIRE(img1);
+        CHECK(img1->Image()[5678] == 504);
+
+        auto img2 = reader.LoadImage(2);
+        REQUIRE(img2);
+        CHECK(img2->Image()[5678] == 507);
+    }
+
+    remove("proc_stride_src_master.h5");
+    for (int i = 1; i <= 5; i++)
+        remove(("proc_stride_src_data_00000" + std::to_string(i) + ".h5").c_str());
+    remove("proc_from_stride_master.h5");
+    REQUIRE(H5Fget_obj_count(H5F_OBJ_ALL, H5F_OBJ_ALL) == 0);
+}
+
 // One reflection with a distinct value in EVERY field that is meant to survive a write/read cycle,
 // keyed on the image and the reflection index so no two are alike and a field read back from the
 // wrong place shows up. Fractional image_number on purpose: a 3D-integrated reflection has one, and
diff --git a/viewer/JFJochImageReadingWorker.cpp b/viewer/JFJochImageReadingWorker.cpp
index 1fb1f8fd..ae7b9cbf 100644
--- a/viewer/JFJochImageReadingWorker.cpp
+++ b/viewer/JFJochImageReadingWorker.cpp
@@ -581,8 +581,16 @@ void JFJochImageReadingWorker::UpdateSpotFindingSettings(const SpotFindingSettin
     indexing_settings.ViableCellMinSpots(indexing.GetViableCellMinSpots());
     indexing_settings.IndexIceRings(indexing.GetIndexIceRings());
     indexing_settings.UnitCellDistTolerance(indexing.GetUnitCellDistTolerance());
-    curr_experiment.ImportIndexingSettings(indexing_settings);
-    curr_experiment.MaxSpotCount(max_spots);
+    // The setters range-check and throw. This runs as a queued slot on the worker's event loop, where
+    // an escaping exception is std::terminate rather than a message, so report it as FindCenter does
+    // and keep the previous settings.
+    try {
+        curr_experiment.ImportIndexingSettings(indexing_settings);
+        curr_experiment.MaxSpotCount(max_spots);
+    } catch (const JFJochException &e) {
+        logger.ErrorException(e);
+        return;
+    }
 
     if (auto_reanalyze) {
         ReanalyzeImage_i();
diff --git a/viewer/widgets/JFJochViewerSettingsDock.cpp b/viewer/widgets/JFJochViewerSettingsDock.cpp
index 72325525..6cca9526 100644
--- a/viewer/widgets/JFJochViewerSettingsDock.cpp
+++ b/viewer/widgets/JFJochViewerSettingsDock.cpp
@@ -20,6 +20,7 @@
 
 #include <cmath>
 
+#include "../../common/Definitions.h"   // MAX_SPOT_COUNT
 #include "SliderPlusBox.h"
 #include "NumberLineEdit.h"
 #include "PowderCalibrationWidget.h"
@@ -253,7 +254,10 @@ QWidget *JFJochViewerSettingsDock::BuildMXPage() {
                                "3/2/1 and keep whichever maximises indexed count x indexed fraction. "
                                "Stills only - a rotation dataset builds one lattice from all frames and "
                                "always uses the fixed min-pixels/spot value below.");
-    auto *maxSpots = new NumberLineEdit(10.0f, 100000.0f, static_cast<float>(max_spots_), 0, "", page);
+    // The same bounds DatasetSettings::MaxSpotCount enforces - offering more than it accepts only got
+    // the value rejected further down.
+    auto *maxSpots = new NumberLineEdit(10.0f, static_cast<float>(MAX_SPOT_COUNT),
+                                        static_cast<float>(max_spots_), 0, "", page);
     spot->addRow("", adaptive);
     spot->addRow("Signal/noise", snr);
     spot->addRow("Photon count", count);