diff --git a/.gitea/workflows/build_and_test.yml b/.gitea/workflows/build_and_test.yml
index ee6cd62e2..58893e991 100644
--- a/.gitea/workflows/build_and_test.yml
+++ b/.gitea/workflows/build_and_test.yml
@@ -126,6 +126,19 @@ jobs:
           for /f "usebackq tokens=*" %%i in (`"%ProgramFiles(x86)%\Microsoft Visual Studio\Installer\vswhere.exe" -latest -property installationPath`) do set "VSPATH=%%i"
           call "%VSPATH%\VC\Auxiliary\Build\vcvars64.bat"
           cmake --build build
+      # The quick cross-platform checks (tests/PortableTest.cpp and the [portable] cases), before
+      # anything is packaged. CPU-only: the runner has no GPU.
+      - name: Build portable tests
+        shell: cmd
+        run: |
+          for /f "usebackq tokens=*" %%i in (`"%ProgramFiles(x86)%\Microsoft Visual Studio\Installer\vswhere.exe" -latest -property installationPath`) do set "VSPATH=%%i"
+          call "%VSPATH%\VC\Auxiliary\Build\vcvars64.bat"
+          cmake --build build --target jfjoch_portable_test
+      - name: Run portable tests
+        shell: cmd
+        run: |
+          cd build\tests
+          jfjoch_portable_test.exe "[portable]"
       - name: Build installer (NSIS)
         shell: cmd
         run: |
@@ -168,6 +181,13 @@ jobs:
         # JFJOCH_VIEWER_ONLY is forced on macOS. No -mcpu: the arm64 baseline is what every Apple
         # Silicon Mac runs, and NEON is part of it.
         run: cmake -S . -B build-macos -DCMAKE_BUILD_TYPE=Release -DJFJOCH_USE_CUDA=OFF -DCMAKE_PREFIX_PATH="$QT_PREFIX"
+      # The quick cross-platform checks (tests/PortableTest.cpp and the [portable] cases), before
+      # anything is packaged.
+      - name: Portable tests
+        shell: bash
+        run: |
+          cmake --build build-macos --target jfjoch_portable_test -j "$(sysctl -n hw.ncpu)"
+          cd build-macos/tests && ./jfjoch_portable_test "[portable]"
       - name: Build viewer and DMG
         shell: bash
         run: |
@@ -380,6 +400,19 @@ jobs:
           for /f "usebackq tokens=*" %%i in (`"%ProgramFiles(x86)%\Microsoft Visual Studio\Installer\vswhere.exe" -latest -property installationPath`) do set "VSPATH=%%i"
           call "%VSPATH%\VC\Auxiliary\Build\vcvars64.bat"
           cmake --build build-rugnux
+      # The quick cross-platform checks (tests/PortableTest.cpp and the [portable] cases), before
+      # anything is packaged. CPU-only: the runner has no GPU.
+      - name: Build portable tests
+        shell: cmd
+        run: |
+          for /f "usebackq tokens=*" %%i in (`"%ProgramFiles(x86)%\Microsoft Visual Studio\Installer\vswhere.exe" -latest -property installationPath`) do set "VSPATH=%%i"
+          call "%VSPATH%\VC\Auxiliary\Build\vcvars64.bat"
+          cmake --build build-rugnux --target jfjoch_portable_test
+      - name: Run portable tests
+        shell: cmd
+        run: |
+          cd build-rugnux\tests
+          jfjoch_portable_test.exe "[portable]"
       - name: Build rugnux zip
         shell: cmd
         run: |
@@ -415,6 +448,13 @@ jobs:
       - name: Configure rugnux build
         shell: bash
         run: cmake -S . -B build-rugnux-macos -DJFJOCH_RUGNUX_ONLY=ON -DJFJOCH_USE_CUDA=OFF -DCMAKE_BUILD_TYPE=Release
+      # The quick cross-platform checks (tests/PortableTest.cpp and the [portable] cases), before
+      # anything is packaged.
+      - name: Portable tests
+        shell: bash
+        run: |
+          cmake --build build-rugnux-macos --target jfjoch_portable_test -j "$(sysctl -n hw.ncpu)"
+          cd build-rugnux-macos/tests && ./jfjoch_portable_test "[portable]"
       - name: Build rugnux tgz
         shell: bash
         run: cmake --build build-rugnux-macos --target package -j "$(sysctl -n hw.ncpu)"
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 33fd421d5..27c88cba7 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -365,10 +365,10 @@ SET(CMAKE_POLICY_VERSION_MINIMUM 3.5)
 # libzmq must be made available BEFORE sls_detector_package for the override above to take effect.
 FetchContent_MakeAvailable(libzmq)
 IF (JFJOCH_PORTABLE_ONLY)
-    # A portable build still needs zstd/hdf5/spdlog/httplib (JFJochReader uses httplib).
-    # Only sls_detector_package (detector) and catch2 (tests) are not built here -- and sls
-    # in particular does not configure under MSVC -- so skip just those two.
-    FetchContent_MakeAvailable(zstd hdf5 spdlog httplib)
+    # A portable build still needs zstd/hdf5/spdlog/httplib (JFJochReader uses httplib), and catch2
+    # for jfjoch_portable_test. Only sls_detector_package (detector) is not built here -- it does
+    # not configure under MSVC.
+    FetchContent_MakeAvailable(zstd catch2 hdf5 spdlog httplib)
 ELSE()
     FetchContent_MakeAvailable(zstd sls_detector_package catch2 hdf5 spdlog httplib)
 ENDIF()
@@ -555,6 +555,7 @@ IF (JFJOCH_RUGNUX_ONLY)
     ADD_SUBDIRECTORY(broker)
     ADD_SUBDIRECTORY(reader)
     ADD_SUBDIRECTORY(rugnux)
+    ADD_SUBDIRECTORY(tests)   # jfjoch_portable_test only
 ELSEIF (JFJOCH_VIEWER_ONLY)
     # Minimal subtree: jfjoch_viewer and only the libraries it transitively links.
     # (broker here provides JFJochAPI only; its service targets are gated out.)
@@ -571,6 +572,7 @@ ELSEIF (JFJOCH_VIEWER_ONLY)
     ADD_SUBDIRECTORY(rugnux)
     ADD_SUBDIRECTORY(viewer)
     ADD_SUBDIRECTORY(tools)   # builds only the portable analysis tools (rugnux/extract_hkl)
+    ADD_SUBDIRECTORY(tests)   # jfjoch_portable_test only
 ELSE()
     ADD_SUBDIRECTORY(jungfrau)
     ADD_SUBDIRECTORY(compression)
diff --git a/tests/AdaptiveSpotFinderCPUTest.cpp b/tests/AdaptiveSpotFinderCPUTest.cpp
index 0db0270a6..14e2cbc61 100644
--- a/tests/AdaptiveSpotFinderCPUTest.cpp
+++ b/tests/AdaptiveSpotFinderCPUTest.cpp
@@ -28,7 +28,7 @@ SpotFindingSettings AdaptiveSettings() {
 // Raw (untransformed) geometry: the mapping is built over the raw module layout, which is smaller
 // than the converted image. The finder has to walk the raw image, so a spot planted at a raw pixel
 // comes back at that pixel.
-TEST_CASE("AdaptiveSpotFinderCPU_RawGeometry", "[AdaptiveSpotFinder]") {
+TEST_CASE("AdaptiveSpotFinderCPU_RawGeometry", "[AdaptiveSpotFinder][portable]") {
     DiffractionExperiment x(DetJF4M());
     x.DetectorDistance_mm(80).BeamX_pxl(1030).BeamY_pxl(1080);
     x.QSpacingForAzimInt_recipA(0.05).QRangeForAzimInt_recipA(0.05, 5.0);
diff --git a/tests/AzimuthalIntegrationTest.cpp b/tests/AzimuthalIntegrationTest.cpp
index d5adf25fc..5151c4faf 100644
--- a/tests/AzimuthalIntegrationTest.cpp
+++ b/tests/AzimuthalIntegrationTest.cpp
@@ -5,6 +5,7 @@
 
 #include "../common/AzimuthalIntegrationProfile.h"
 #include "../common/AzimuthalIntegrationMapping.h"
+#include "../common/JFJochMath.h"
 
 TEST_CASE("AzimuthalIntegrationMapping_Constructor","[AzimuthalIntegration]") {
     DiffractionExperiment x(DetJF4M());
@@ -39,7 +40,7 @@ TEST_CASE("AzimuthalIntegrationMapping_GetBinNumber_mask","[AzimuthalIntegration
     for (int row = 0; row < x.GetYPixelsNum(); row++) {
         for (int col = 0; col < x.GetXPixelsNum(); col++) {
             float d = geom.PxlToRes(col, row);
-            float q = 2 * M_PI / d;
+            float q = 2 * PI / d;
             if (q >= 3.1)
                 pixel_mask[row * x.GetXPixelsNum() + col] = 1;
         }
@@ -147,7 +148,7 @@ TEST_CASE("AzimuthalIntegrationMapping_GetMapping","[AzimuthalIntegration]") {
     CHECK(map[x.GetXPixelsNum() * 1500 + 1500] / 40 == 0);
 }
 
-TEST_CASE("AzimuthalIntegrationMapping_QToBin","[AzimuthalIntegration]") {
+TEST_CASE("AzimuthalIntegrationMapping_QToBin","[AzimuthalIntegration][portable]") {
     DiffractionExperiment x(DetJF4M());
     x.DetectorDistance_mm(50).BeamX_pxl(1000).BeamY_pxl(1000);
     x.QSpacingForAzimInt_recipA(0.1).QRangeForAzimInt_recipA(0.1, 4);
@@ -400,7 +401,7 @@ TEST_CASE("AzimuthalIntegrationProfile_GetMeanValueOfBins","[AzimuthalIntegratio
     REQUIRE(profile.GetBkgEstimate(x.GetAzimuthalIntegrationSettings()) == Catch::Approx((sum[0] + sum[1] + sum[2])  / double(count[0] + count[1] + count[2])));
 }
 
-TEST_CASE("AzimuthalIntegrationProfile_GetResult1D","[AzimuthalIntegration]") {
+TEST_CASE("AzimuthalIntegrationProfile_GetResult1D","[AzimuthalIntegration][portable]") {
     DiffractionExperiment x(DetJF4M());
     x.DetectorDistance_mm(50).BeamX_pxl(1000).BeamY_pxl(1000);
 
diff --git a/tests/BraggIntegrationEngineCompressedImageTest.cpp b/tests/BraggIntegrationEngineCompressedImageTest.cpp
index 46344bb22..881c4b4b8 100644
--- a/tests/BraggIntegrationEngineCompressedImageTest.cpp
+++ b/tests/BraggIntegrationEngineCompressedImageTest.cpp
@@ -93,7 +93,7 @@ void RequireIdentical(const std::vector<Reflection> &a, const std::vector<Reflec
 
 }   // namespace
 
-TEST_CASE("BraggIntegrationEngineCPU_CompressedImageMatchesBuffer", "[Integration]") {
+TEST_CASE("BraggIntegrationEngineCPU_CompressedImageMatchesBuffer", "[Integration][portable]") {
     for (const auto mode : {IntegratorMode::BoxSum, IntegratorMode::ProfileGaussian, IntegratorMode::ProfileEmpirical}) {
         const DiffractionExperiment experiment = MakeExperiment(mode);
         const size_t W = experiment.GetXPixelsNum(), H = experiment.GetYPixelsNum();
diff --git a/tests/BraggStencilTest.cpp b/tests/BraggStencilTest.cpp
index 591ee16a3..4d37aa86a 100644
--- a/tests/BraggStencilTest.cpp
+++ b/tests/BraggStencilTest.cpp
@@ -140,7 +140,7 @@ TEST_CASE("BraggStencil_GrowthIsCapped", "[Integration]") {
 // The kernel table is indexed by the growth rounded to whole pixels, so the table has to have a row
 // for every index any reflection on the detector can produce. An off-by-one here is an out-of-range
 // read of k_diff - on the GPU, a device-side one.
-TEST_CASE("BraggStencil_KernelIndexInRange", "[Integration]") {
+TEST_CASE("BraggStencil_KernelIndexInRange", "[Integration][portable]") {
     for (const float k : {0.0f, 0.4f, 1.0f, 2.5f, 3.0f, 6.0f}) {
         const BraggStencilParams p = Params(k);
         const float r_max = std::hypot(800.0f - p.beam_x, 800.0f - p.beam_y);
diff --git a/tests/CBORTest.cpp b/tests/CBORTest.cpp
index abd43b243..8df4dd5a6 100644
--- a/tests/CBORTest.cpp
+++ b/tests/CBORTest.cpp
@@ -9,7 +9,7 @@
 #include "../frame_serialize/CborUtil.h"
 #include "../common/DiffractionExperiment.h"   // kImageMetadataHeadroom
 
-TEST_CASE("CBORSerialize_Start", "[CBOR]") {
+TEST_CASE("CBORSerialize_Start", "[CBOR][portable]") {
     std::vector<uint8_t> buffer(8 * 1024 * 1024);
     CBORStream2Serializer serializer(buffer.data(), buffer.size());
 
@@ -491,7 +491,7 @@ TEST_CASE("CBORSerialize_Calibration", "[CBOR]") {
     CHECK(memcmp(output_message.GetCompressed(), calib1.data(), 256 * sizeof(float)) == 0);
 }
 
-TEST_CASE("CBORSerialize_End", "[CBOR]") {
+TEST_CASE("CBORSerialize_End", "[CBOR][portable]") {
     std::vector<uint8_t> buffer(8 * 1024 * 1024);
     CBORStream2Serializer serializer(buffer.data(), buffer.size());
 
@@ -897,7 +897,7 @@ TEST_CASE("CBORSerialize_Image_Rgb", "[CBOR]") {
     REQUIRE(memcmp(image_array.image.GetCompressed(), test.data(), test.size() * sizeof(rgb)) == 0);
 }
 
-TEST_CASE("CBORSerialize_Image_Compressed", "[CBOR]") {
+TEST_CASE("CBORSerialize_Image_Compressed", "[CBOR][portable]") {
     std::vector<uint8_t> buffer(8 * 1024 * 1024);
     CBORStream2Serializer serializer(buffer.data(), buffer.size());
 
@@ -1026,7 +1026,7 @@ TEST_CASE("CBORSerialize_Start_ROIMap", "[CBOR]") {
 }
 
 
-TEST_CASE("CBORSerialize_Image_Spots", "[CBOR]") {
+TEST_CASE("CBORSerialize_Image_Spots", "[CBOR][portable]") {
     std::vector<uint8_t> buffer(8 * 1024 * 1024);
     CBORStream2Serializer serializer(buffer.data(), buffer.size());
 
diff --git a/tests/CMakeLists.txt b/tests/CMakeLists.txt
index 5b386a5a4..81ab48540 100644
--- a/tests/CMakeLists.txt
+++ b/tests/CMakeLists.txt
@@ -1,4 +1,41 @@
+# Quick cross-platform checks: the results that depend on the architecture, the compiler or the
+# standard library (bitshuffle/LZ4 SIMD paths, HDF5 read-back, CBF parsing, CPU spot finding, FFTW
+# indexing, gemmi MTZ/CIF). Built in every configuration, the portable (viewer/rugnux-only) ones
+# included, and linked only against what those build - so it runs on the macOS and Windows jobs.
+# Only the cases tagged [portable] are meant to run there (a few seconds in all); the rest of these
+# files is compiled in because the tagged cases live next to them.
+# EXCLUDE_FROM_ALL: a product build does not pay for it, CI builds the target by name.
+ADD_EXECUTABLE(jfjoch_portable_test EXCLUDE_FROM_ALL
+        PortableTest.cpp
+        TestData.h
+        ZSTDCompressorTest.cpp
+        JFJochReaderTest.cpp
+        SweepLayoutTest.cpp
+        CBORTest.cpp
+        ImageSpotFinderCPUTest.cpp
+        AdaptiveSpotFinderCPUTest.cpp
+        AzimuthalIntegrationTest.cpp
+        CalcBraggPredictionTest.cpp
+        BraggStencilTest.cpp
+        BraggIntegrationEngineCompressedImageTest.cpp
+        WriteReflectionsTest.cpp
+        LoadReferenceMtzFreeFlagsTest.cpp
+        LoadReferenceSfCifTest.cpp
+)
+target_link_libraries(jfjoch_portable_test Catch2WithMain JFJochRugnux JFJochReader JFJochImageAnalysis
+                      JFJochWriter JFJochCommon)
+target_include_directories(jfjoch_portable_test PRIVATE .)
+# Same device-link step as rugnux (see rugnux/CMakeLists.txt): a portable CUDA build links cuFFT statically.
+IF (JFJOCH_PORTABLE_ONLY AND JFJOCH_CUDA_AVAILABLE AND TARGET CUDA::cufft_static)
+    SET_TARGET_PROPERTIES(jfjoch_portable_test PROPERTIES CUDA_RESOLVE_DEVICE_SYMBOLS ON)
+ENDIF()
+
+IF (JFJOCH_PORTABLE_ONLY)
+    RETURN()
+ENDIF()
+
 ADD_EXECUTABLE(jfjoch_test
+        PortableTest.cpp
         DiffractionExperimentTest.cpp
         RawToConvertedGeometryTest.cpp
         ../common/RawToConvertedGeometry.h
diff --git a/tests/CalcBraggPredictionTest.cpp b/tests/CalcBraggPredictionTest.cpp
index 9d94c9a90..48f0c1661 100644
--- a/tests/CalcBraggPredictionTest.cpp
+++ b/tests/CalcBraggPredictionTest.cpp
@@ -4,6 +4,7 @@
 #include <catch2/catch_all.hpp>
 
 #include "../image_analysis/bragg_prediction/BraggPrediction.h"
+#include "../common/JFJochMath.h"
 #include <iostream>
 #include "../image_analysis/SensorAbsorption.h"
 #include "../image_analysis/bragg_prediction/BraggPredictionRot.h"
@@ -40,11 +41,11 @@ TEST_CASE("BraggPrediction_FlightPathAttenuation", "[air_path]") {
     // crossed strictly more of the medium.
     float prev = 1.0f;
     for (double alpha_deg : {10.0, 20.0, 30.0, 40.0, 50.0, 55.0}) {
-        const float f = a18.Factor(static_cast<float>(std::cos(alpha_deg * M_PI / 180.0)));
+        const float f = a18.Factor(static_cast<float>(std::cos(alpha_deg * PI / 180.0)));
         CHECK(f > prev);
         prev = f;
     }
-    const float cos55 = static_cast<float>(std::cos(55.0 * M_PI / 180.0));
+    const float cos55 = static_cast<float>(std::cos(55.0 * PI / 180.0));
     // 18 keV over 160 mm at 55 degrees: +1.5%.
     CHECK(a18.Factor(cos55) == Catch::Approx(1.0147).epsilon(0.002));
 
@@ -88,7 +89,7 @@ TEST_CASE("BraggPrediction_FlightPathAttenuation", "[air_path]") {
     CHECK(vac.WilsonBShift_A2(3.02, 50.0, lambda_of(3.76)) == 0.0);
 }
 
-TEST_CASE("BraggPrediction_11keV") {
+TEST_CASE("BraggPrediction_11keV", "[portable]") {
     DiffractionExperiment experiment(DetJF4M());
     experiment.DetectorDistance_mm(100.0).BeamX_pxl(1500.0).BeamY_pxl(1000.0)
     .IncidentEnergy_keV(11.0);
@@ -160,10 +161,10 @@ TEST_CASE("BraggPrediction_15keV") {
     }
 }
 
-TEST_CASE("BraggPrediction_Rot1_Rot2") {
+TEST_CASE("BraggPrediction_Rot1_Rot2", "[portable]") {
     DiffractionExperiment experiment(DetJF4M());
     experiment.DetectorDistance_mm(100.0).BeamX_pxl(1500.0).BeamY_pxl(1000.0)
-    .PoniRot1_rad(2.0/180.0 * M_PI).PoniRot2_rad(3.0/180.0 * M_PI)
+    .PoniRot1_rad(2.0/180.0 * PI).PoniRot2_rad(3.0/180.0 * PI)
     .IncidentEnergy_keV(11.0);
 
     DiffractionGeometry geom = experiment.GetDiffractionGeometry();
@@ -224,7 +225,7 @@ TEST_CASE("BraggPrediction_backscattering") {
     }
 }
 
-TEST_CASE("BraggPrediction_systematic_absences") {
+TEST_CASE("BraggPrediction_systematic_absences", "[portable]") {
     DiffractionExperiment experiment(DetJF4M());
     experiment.DetectorDistance_mm(120.0).BeamX_pxl(1500.0).BeamY_pxl(1000.0)
         .IncidentEnergy_keV(12.0);
@@ -404,7 +405,7 @@ TEST_CASE("BraggPredictionGPU") {
 TEST_CASE("BraggPredictionGPU_Rot1_Rot2") {
     DiffractionExperiment experiment(DetJF4M());
     experiment.DetectorDistance_mm(100.0).BeamX_pxl(1500.0).BeamY_pxl(1000.0)
-    .PoniRot1_rad(2.0/180.0 * M_PI).PoniRot2_rad(3.0/180.0 * M_PI)
+    .PoniRot1_rad(2.0/180.0 * PI).PoniRot2_rad(3.0/180.0 * PI)
     .IncidentEnergy_keV(11.0);
 
     DiffractionGeometry geom = experiment.GetDiffractionGeometry();
diff --git a/tests/ImageSpotFinderCPUTest.cpp b/tests/ImageSpotFinderCPUTest.cpp
index fe680a6cb..35d06773e 100644
--- a/tests/ImageSpotFinderCPUTest.cpp
+++ b/tests/ImageSpotFinderCPUTest.cpp
@@ -4,7 +4,7 @@
 #include <catch2/catch_all.hpp>
 #include "../image_analysis/spot_finding/ImageSpotFinderCPU.h"
 
-TEST_CASE("ImageSpotFinderCPU_SignalToNoise") {
+TEST_CASE("ImageSpotFinderCPU_SignalToNoise", "[portable]") {
     size_t width = 100;
     size_t height = 100;
 
@@ -108,7 +108,7 @@ TEST_CASE("ImageSpotFinderCPU_CountThreshold_Resolution") {
     REQUIRE(spots[1].RawCoord().y == 75);
 }
 
-TEST_CASE("ImageSpotFinderCPU_CountThreshold_Mask") {
+TEST_CASE("ImageSpotFinderCPU_CountThreshold_Mask", "[portable]") {
     size_t width = 100;
     size_t height = 100;
 
diff --git a/tests/JFJochReaderTest.cpp b/tests/JFJochReaderTest.cpp
index ba8d01780..9ade44cb7 100644
--- a/tests/JFJochReaderTest.cpp
+++ b/tests/JFJochReaderTest.cpp
@@ -608,7 +608,7 @@ TEST_CASE("JFJochReader_GridScan", "[HDF5][Full]") {
     REQUIRE(H5Fget_obj_count(H5F_OBJ_ALL, H5F_OBJ_ALL) == 0);
 }
 
-TEST_CASE("JFJochReader_DataI16", "[HDF5][Full]") {
+TEST_CASE("JFJochReader_DataI16", "[HDF5][Full][portable]") {
     DiffractionExperiment x(DetJF(1));
 
     x.FilePrefix("test09").ImagesPerTrigger(4).OverwriteExistingFiles(true);
@@ -774,7 +774,7 @@ TEST_CASE("JFJochReader_DataI16_OldMasterFormat", "[HDF5][Full]") {
     REQUIRE(H5Fget_obj_count(H5F_OBJ_ALL, H5F_OBJ_ALL) == 0);
 }
 
-TEST_CASE("JFJochReader_DataU16", "[HDF5][Full]") {
+TEST_CASE("JFJochReader_DataU16", "[HDF5][Full][portable]") {
     DiffractionExperiment x(DetJF(1));
 
     x.FilePrefix("test10").ImagesPerTrigger(4).OverwriteExistingFiles(true);
@@ -846,7 +846,7 @@ TEST_CASE("JFJochReader_DataU16", "[HDF5][Full]") {
     REQUIRE(H5Fget_obj_count(H5F_OBJ_ALL, H5F_OBJ_ALL) == 0);
 }
 
-TEST_CASE("JFJochReader_DataI32", "[HDF5][Full]") {
+TEST_CASE("JFJochReader_DataI32", "[HDF5][Full][portable]") {
     DiffractionExperiment x(DetJF(1));
 
     x.FilePrefix("test11").ImagesPerTrigger(4).OverwriteExistingFiles(true);
@@ -913,7 +913,7 @@ TEST_CASE("JFJochReader_DataI32", "[HDF5][Full]") {
     REQUIRE(H5Fget_obj_count(H5F_OBJ_ALL, H5F_OBJ_ALL) == 0);
 }
 
-TEST_CASE("JFJochReader_DataU32", "[HDF5][Full]") {
+TEST_CASE("JFJochReader_DataU32", "[HDF5][Full][portable]") {
     DiffractionExperiment x(DetJF(1));
 
     x.FilePrefix("test12").ImagesPerTrigger(4).OverwriteExistingFiles(true);
@@ -1786,7 +1786,7 @@ TEST_CASE("JFJochReader_NXmxIntegrated", "[HDF5][Full]") {
     REQUIRE(H5Fget_obj_count(H5F_OBJ_ALL, H5F_OBJ_ALL) == 0);
 }
 
-TEST_CASE("JFJochReader_GetRawImage_NXmxLegacy", "[HDF5][Full]") {
+TEST_CASE("JFJochReader_GetRawImage_NXmxLegacy", "[HDF5][Full][portable]") {
     DiffractionExperiment x(DetJF(1));
 
     x.FilePrefix("test_read_raw_image").ImagesPerTrigger(4).OverwriteExistingFiles(true);
@@ -1906,7 +1906,7 @@ TEST_CASE("JFJochReader_GetRawImage_Concurrent", "[HDF5][Full]") {
     REQUIRE(H5Fget_obj_count(H5F_OBJ_ALL, H5F_OBJ_ALL) == 0);
 }
 
-TEST_CASE("JFJochReader_GetRawImage_VDS", "[HDF5][Full]") {
+TEST_CASE("JFJochReader_GetRawImage_VDS", "[HDF5][Full][portable]") {
     DiffractionExperiment x(DetJF(1));
 
     x.FilePrefix("test_read_raw_image").ImagesPerTrigger(4).OverwriteExistingFiles(true);
@@ -1965,7 +1965,7 @@ TEST_CASE("JFJochReader_GetRawImage_VDS", "[HDF5][Full]") {
     REQUIRE(H5Fget_obj_count(H5F_OBJ_ALL, H5F_OBJ_ALL) == 0);
 }
 
-TEST_CASE("JFJochReader_GetRawImage_Integrated", "[HDF5][Full]") {
+TEST_CASE("JFJochReader_GetRawImage_Integrated", "[HDF5][Full][portable]") {
     DiffractionExperiment x(DetJF(1));
 
     x.FilePrefix("test_read_raw_image").ImagesPerTrigger(4).OverwriteExistingFiles(true);
@@ -2022,7 +2022,7 @@ TEST_CASE("JFJochReader_GetRawImage_Integrated", "[HDF5][Full]") {
     REQUIRE(H5Fget_obj_count(H5F_OBJ_ALL, H5F_OBJ_ALL) == 0);
 }
 
-TEST_CASE("JFJochReader_HDF5DataSource_Integrated", "[HDF5][Full]") {
+TEST_CASE("JFJochReader_HDF5DataSource_Integrated", "[HDF5][Full][portable]") {
     DiffractionExperiment x(DetJF(1));
 
     x.FilePrefix("source_integrated").ImagesPerTrigger(5).OverwriteExistingFiles(true);
@@ -2070,7 +2070,7 @@ TEST_CASE("JFJochReader_HDF5DataSource_Integrated", "[HDF5][Full]") {
     REQUIRE(H5Fget_obj_count(H5F_OBJ_ALL, H5F_OBJ_ALL) == 0);
 }
 
-TEST_CASE("JFJochReader_HDF5DataSource_VDS", "[HDF5][Full]") {
+TEST_CASE("JFJochReader_HDF5DataSource_VDS", "[HDF5][Full][portable]") {
     DiffractionExperiment x(DetJF(1));
 
     x.FilePrefix("source_vds_mapping").ImagesPerTrigger(5).ImagesPerFile(2).OverwriteExistingFiles(true);
@@ -2131,7 +2131,7 @@ TEST_CASE("JFJochReader_HDF5DataSource_VDS", "[HDF5][Full]") {
     REQUIRE(H5Fget_obj_count(H5F_OBJ_ALL, H5F_OBJ_ALL) == 0);
 }
 
-TEST_CASE("JFJochReader_HDF5DataSource_Legacy", "[HDF5][Full]") {
+TEST_CASE("JFJochReader_HDF5DataSource_Legacy", "[HDF5][Full][portable]") {
     DiffractionExperiment x(DetJF(1));
 
     x.FilePrefix("source_legacy_mapping").ImagesPerTrigger(5).ImagesPerFile(2).OverwriteExistingFiles(true);
@@ -3434,7 +3434,7 @@ TEST_CASE("JFJochReader_AxisRecovery", "[HDF5][Full]") {
 // saturation_value is written inclusive and used exclusive, so a read has to add the count back. It
 // did not, and the value fell by one on every write-read-write cycle - unbounded, and compounding
 // whenever a _process.h5 was reprocessed. Nothing caught it: no test asserted the read-back limit.
-TEST_CASE("JFJochReader_SaturationSurvivesRoundTrip", "[HDF5][Full]") {
+TEST_CASE("JFJochReader_SaturationSurvivesRoundTrip", "[HDF5][Full][portable]") {
     DiffractionExperiment x(DetJF(1));
     x.ImagesPerTrigger(2).OverwriteExistingFiles(true).FilePrefix("test_satrt");
     x.BeamX_pxl(100).BeamY_pxl(200).DetectorDistance_mm(150)
@@ -3958,7 +3958,7 @@ namespace {
     }
 }
 
-TEST_CASE("JFJochCBFReader_AxisTableStatesTheMounting", "[HDF5][Full]") {
+TEST_CASE("JFJochCBFReader_AxisTableStatesTheMounting", "[HDF5][Full][portable]") {
     const int64_t nx = 24, ny = 16;
 
     SECTION("a pixel at Count_cutoff is saturated") {
@@ -4081,7 +4081,7 @@ namespace {
 
 // Three ways a CBF that is not a detector image, or is one with a hole in its head, used to be
 // opened anyway - each of them silently, which is the failure this project cares most about.
-TEST_CASE("JFJochCBFReader_incomplete_header_is_refused_not_misread", "[HDF5][Full]") {
+TEST_CASE("JFJochCBFReader_incomplete_header_is_refused_not_misread", "[HDF5][Full][portable]") {
     const int64_t nx = 24, ny = 16;
 
     SECTION("a byte-offset CBF with no PILATUS header is not ours to read") {
@@ -4128,7 +4128,7 @@ TEST_CASE("JFJochCBFReader_incomplete_header_is_refused_not_misread", "[HDF5][Fu
     }
 }
 
-TEST_CASE("MiniCBF_header_longer_than_the_first_probe", "[HDF5][Full]") {
+TEST_CASE("MiniCBF_header_longer_than_the_first_probe", "[HDF5][Full][portable]") {
     // The header is read with a small first probe, and again with the large one when it does not end
     // inside it; what stands past the first 16 kB must come out exactly as before.
     std::string filler;
@@ -4261,7 +4261,7 @@ namespace {
     }
 }
 
-TEST_CASE("JFJochMarCCDReader_Geometry", "[HDF5][Full]") {
+TEST_CASE("JFJochMarCCDReader_Geometry", "[HDF5][Full][portable]") {
     const int64_t nx = 24, ny = 16;
 
     SECTION("the header's geometry reaches the experiment in the units the rest of the code uses") {
@@ -4425,7 +4425,7 @@ namespace {
     }
 }
 
-TEST_CASE("JFJochSMVReader_Geometry", "[HDF5][Full]") {
+TEST_CASE("JFJochSMVReader_Geometry", "[HDF5][Full][portable]") {
     SECTION("a pixel at CCD_IMAGE_SATURATION is saturated, stated or not") {
         // The pixels are handed out as 32-bit, so without an explicit limit the fallback would be
         // INT32_MAX and no 16-bit image could ever reach it.
diff --git a/tests/LoadReferenceMtzFreeFlagsTest.cpp b/tests/LoadReferenceMtzFreeFlagsTest.cpp
index c2c5b811f..12bc73e43 100644
--- a/tests/LoadReferenceMtzFreeFlagsTest.cpp
+++ b/tests/LoadReferenceMtzFreeFlagsTest.cpp
@@ -42,7 +42,7 @@ namespace {
     bool ExpectedFree(int h, int k, int l) { return (h * 7 + k * 13 + l * 17) % 10 == 0; }
 }
 
-TEST_CASE("LoadReferenceMtz imports FreeR (CCP4 convention: test set = 0)", "[reference_mtz]") {
+TEST_CASE("LoadReferenceMtz imports FreeR (CCP4 convention: test set = 0)", "[reference_mtz][portable]") {
     const auto path = (std::filesystem::temp_directory_path() / "rugnux_freer_ccp4.mtz").string();
     WriteMtzWithFreeR(path, /*free_value=*/0);
     const auto ref = LoadReferenceMtz(path);
diff --git a/tests/LoadReferenceSfCifTest.cpp b/tests/LoadReferenceSfCifTest.cpp
index b56a2dff6..c8027fb15 100644
--- a/tests/LoadReferenceSfCifTest.cpp
+++ b/tests/LoadReferenceSfCifTest.cpp
@@ -100,7 +100,7 @@ _refln.intensity_sigma
     }
 }
 
-TEST_CASE("LoadReferenceMtz reads a structure-factor mmCIF", "[reference_mtz]") {
+TEST_CASE("LoadReferenceMtz reads a structure-factor mmCIF", "[reference_mtz][portable]") {
     // Named without a .cif extension: the format is recognised by content.
     const auto path = WriteFile("rugnux_ref_sf.dat", SF_CIF);
     const auto ref = LoadReferenceMtz(path);
diff --git a/tests/PortableTest.cpp b/tests/PortableTest.cpp
new file mode 100644
index 000000000..3c67eed15
--- /dev/null
+++ b/tests/PortableTest.cpp
@@ -0,0 +1,184 @@
+// SPDX-FileCopyrightText: 2026 Filip Leonarski, Paul Scherrer Institute <filip.leonarski@psi.ch>
+// SPDX-License-Identifier: GPL-3.0-only
+
+// Checks that the results which depend on the architecture, the compiler or the standard library are
+// the same everywhere: the bitshuffle/LZ4 path (hperf SSE2/AVX2 on x86, NEON on aarch64, SSE2 under
+// MSVC) and an end-to-end run of the analysis. Golden values were taken on x86-64 Linux; an arm64
+// or MSVC build that disagrees has a portability defect, not a new reference.
+
+#include <catch2/catch_all.hpp>
+
+#include <cstring>
+#include <thread>
+
+#include "TestData.h"
+#include "../compression/JFJochCompressor.h"
+#include "../compression/JFJochDecompress.h"
+#include "../common/JFJochMath.h"
+#include "../writer/HDF5Objects.h"
+#include "../image_analysis/indexing/IndexerFactory.h"
+#include "../reader/JFJochHDF5Reader.h"
+#include "../rugnux/Rugnux.h"
+
+namespace {
+    // FNV-1a, spelled out: std::hash is not the same function on every standard library.
+    uint64_t Fnv1a(const void *data, size_t size) {
+        auto p = static_cast<const uint8_t *>(data);
+        uint64_t h = 1469598103934665603ULL;
+        for (size_t i = 0; i < size; i++) {
+            h ^= p[i];
+            h *= 1099511628211ULL;
+        }
+        return h;
+    }
+
+    uint64_t SplitMix64(uint64_t &state) {
+        uint64_t z = (state += 0x9e3779b97f4a7c15ULL);
+        z = (z ^ (z >> 30)) * 0xbf58476d1ce4e5b9ULL;
+        z = (z ^ (z >> 27)) * 0x94d049bb133111ebULL;
+        return z ^ (z >> 31);
+    }
+}
+
+// compression_benchmark.h5 holds 25 int16 frames, bitshuffle/LZ4 (HDF5 filter 32008). One frame is
+// read three ways - the raw chunk decoded by the hperf path and by the classic bitshuffle, and
+// through the HDF5 filter - and all three must give the frame whose hash was recorded on x86.
+TEST_CASE("Portable_BSLZ4_BenchmarkFrameGoldenHash", "[portable][compression]") {
+    RegisterHDF5Filter();
+    HDF5ReadOnlyFile file("../../tests/test_data/compression_benchmark.h5");
+    HDF5DataSet dataset(file, "/entry/data/data");
+    HDF5DataSpace file_space(dataset);
+    const auto dims = file_space.GetDimensions();
+    REQUIRE(dims.size() == 3);
+    const size_t npixel = dims[1] * dims[2];
+
+    const std::pair<hsize_t, uint64_t> golden[] = {
+            {0, 0xaffea29c511b6ec2ULL},
+            {24, 0xe46913009c95a1f1ULL}
+    };
+
+    for (const auto &[frame, hash]: golden) {
+        std::vector<uint8_t> chunk;
+        dataset.ReadDirectChunk(chunk, {frame, 0, 0});
+
+        std::vector<int16_t> hperf, classic, filtered(npixel);
+        JFJochDecompress(hperf, CompressionAlgorithm::BSHUF_LZ4, chunk, npixel, true);
+        JFJochDecompress(classic, CompressionAlgorithm::BSHUF_LZ4, chunk, npixel, false);
+        dataset.ReadVector(filtered, {frame, 0, 0}, {1, dims[1], dims[2]});
+
+        CHECK(Fnv1a(hperf.data(), hperf.size() * sizeof(int16_t)) == hash);
+        CHECK(hperf == classic);
+        CHECK(hperf == filtered);
+    }
+}
+
+// The encoder must write the same bytes everywhere: a file is decoded on a different machine from
+// the one that wrote it, and the header of every block is big-endian regardless of the host.
+TEST_CASE("Portable_BSLZ4_EncodeGoldenHash", "[portable][compression]") {
+    uint64_t state = 42;
+    std::vector<uint32_t> image(1024 * 1024 + 13);   // a tail that is not a whole block
+    for (auto &v: image)
+        v = (SplitMix64(state) % 16 == 0) ? SplitMix64(state) % 200 : 0;
+
+    JFJochBitShuffleCompressor compressor(CompressionAlgorithm::BSHUF_LZ4);
+    auto compressed = compressor.Compress(image);
+    CHECK(compressed.size() == 562349);
+    CHECK(Fnv1a(compressed.data(), compressed.size()) == 0x874e45eb17a51ed2ULL);
+
+    std::vector<uint32_t> decoded;
+    JFJochDecompress(decoded, CompressionAlgorithm::BSHUF_LZ4, compressed, image.size());
+    CHECK(decoded == image);
+}
+
+// One bitshuffle block through the shipped selector (hperf on x86, classic NEON on aarch64) against
+// the classic reference transform, over the element sizes and block tails the file format allows.
+TEST_CASE("Portable_BitShuffleBlock_MatchesReference", "[portable][compression]") {
+    uint64_t state = 7;
+    for (size_t elem: {1, 2, 4, 8}) {
+        for (size_t size: {8, 16, 24, 136, 1032, 2040, 2048, 8192}) {
+            for (int pattern = 0; pattern < 3; pattern++) {
+                std::vector<char> orig(size * elem), ref(size * elem), enc(size * elem),
+                        scratch(size * elem), out(size * elem);
+                for (size_t i = 0; i < orig.size(); i++) {
+                    if (pattern == 0) orig[i] = static_cast<char>(SplitMix64(state));                  // noise
+                    else if (pattern == 1) orig[i] = (i % elem == 0) ? static_cast<char>(i % 7) : 0; // counts
+                    else orig[i] = static_cast<char>((i % elem == elem - 1) ? 0x80 : 0);           // sign bit
+                }
+                INFO("elem " << elem << " size " << size << " pattern " << pattern);
+                REQUIRE(bshuf_trans_bit_elem(orig.data(), ref.data(), size, elem) >= 0);
+                REQUIRE(JFJochBitShuffleBlock(enc.data(), orig.data(), scratch.data(), size, elem) >= 0);
+                CHECK(enc == ref);
+                REQUIRE(JFJochBitUnshuffleBlock(out.data(), ref.data(), scratch.data(), size, elem) >= 0);
+                CHECK(out == orig);
+            }
+        }
+    }
+}
+
+// The CPU indexer (FFTW, NEON codelets on arm64) on a synthetic orthorhombic lattice. Named
+// explicitly rather than through Auto, so a CUDA build on a runner without a GPU tests it too.
+TEST_CASE("Portable_FFTWIndexer_SyntheticLattice", "[portable][Indexing]") {
+    const UnitCell uc(39, 45, 78, 90, 90, 90);
+    const CrystalLattice cl(uc);
+
+    DiffractionExperiment experiment;
+    IndexingSettings settings;
+    settings.Algorithm(IndexingAlgorithmEnum::FFTW).FFT_MaxUnitCell_A(250.0).FFT_HighResolution_A(2 * PI / 3.0);
+    experiment.ImportIndexingSettings(settings).SetUnitCell(uc);
+    auto indexer = CreateIndexer(experiment);
+    REQUIRE(indexer);
+
+    std::vector<Coord> spots;
+    for (int h = -2; h < 10; h++)
+        for (int k = -5; k < 10; k++)
+            for (int l = -3; l < 10; l++)
+                spots.push_back(h * cl.Astar() + k * cl.Bstar() + l * cl.Cstar());
+
+    const auto result = indexer->Run(spots);
+    REQUIRE(result.lattice.size() == 1);
+    const auto out = result.lattice[0].GetUnitCell();
+    std::array<double, 3> lengths = {out.a, out.b, out.c};
+    std::sort(lengths.begin(), lengths.end());
+    CHECK(lengths[0] == Catch::Approx(39.0));
+    CHECK(lengths[1] == Catch::Approx(45.0));
+    CHECK(lengths[2] == Catch::Approx(78.0));
+    CHECK(out.alpha == Catch::Approx(90.0));
+    CHECK(out.beta == Catch::Approx(90.0));
+    CHECK(out.gamma == Catch::Approx(90.0));
+}
+
+// End to end on the git-LFS rotation dataset (tests/data, see README.md there): HDF5 read through
+// external links, CPU spot finding, the default indexer (FFTW on a CPU build), refinement and
+// integration, on a short wedge. SKIPs when LFS was not pulled.
+TEST_CASE("Portable_Rugnux_RotationWedge", "[portable][lfs]") {
+    const auto master = jfjoch_test::LargeDataFile("rotation_master.h5");
+    if (!master)
+        SKIP("rotation_master.h5 not available (git-lfs data not pulled)");
+
+    RegisterHDF5Filter();
+    JFJochHDF5Reader reader;
+    REQUIRE_NOTHROW(reader.ReadFile(*master));
+    auto dataset = reader.GetDataset();
+    REQUIRE(dataset);
+
+    DiffractionExperiment experiment(dataset->experiment);
+    IndexingSettings indexing;
+    indexing.Algorithm(IndexingAlgorithmEnum::Auto);
+    experiment.ImportIndexingSettings(indexing);
+
+    ProcessConfig config;
+    config.mode = ProcessMode::FullAnalysis;
+    config.nthreads = std::max(1u, std::thread::hardware_concurrency());
+    config.end_image = 4;
+    config.spot_finding = DiffractionExperiment::DefaultDataProcessingSettings();
+    config.spot_finding.indexing = true;
+
+    Rugnux process(reader, experiment, *dataset->pixel_mask, config);
+    ProcessResult result;
+    REQUIRE_NOTHROW(result = process.Run());
+
+    CHECK(result.images_processed == 4);
+    REQUIRE(result.indexing_rate.has_value());
+    CHECK(result.indexing_rate.value() > 0.5f);
+    reader.Close();
+}
diff --git a/tests/SweepLayoutTest.cpp b/tests/SweepLayoutTest.cpp
index a3ef530d3..88663dde5 100644
--- a/tests/SweepLayoutTest.cpp
+++ b/tests/SweepLayoutTest.cpp
@@ -21,7 +21,7 @@ std::vector<sweep::Frame> Series(const std::vector<double> &angles, double incre
 
 }  // namespace
 
-TEST_CASE("SweepLayout_Contiguous") {
+TEST_CASE("SweepLayout_Contiguous", "[portable]") {
     std::vector<double> angles;
     for (int i = 0; i < 100; i++)
         angles.push_back(20.0 + 0.1 * i);
@@ -34,7 +34,7 @@ TEST_CASE("SweepLayout_Contiguous") {
         CHECK(l.files[i] == "f" + std::to_string(i) + ".cbf");
 }
 
-TEST_CASE("SweepLayout_Gapped") {
+TEST_CASE("SweepLayout_Gapped", "[portable]") {
     // Frames 3, 4 and 7 of a ten-frame sweep never made it into the archive. The sweep is still ten
     // steps wide and every frame keeps its own angle.
     const auto l = sweep::Place(Series({0.0, 0.1, 0.2, 0.5, 0.6, 0.8, 0.9}, 0.1), "test");
diff --git a/tests/WriteReflectionsTest.cpp b/tests/WriteReflectionsTest.cpp
index 8609e410e..b8e6d06c4 100644
--- a/tests/WriteReflectionsTest.cpp
+++ b/tests/WriteReflectionsTest.cpp
@@ -31,7 +31,7 @@ namespace {
     }
 }
 
-TEST_CASE("Merged MTZ: the data dataset is id 1 and carries the wavelength", "[write_reflections]") {
+TEST_CASE("Merged MTZ: the data dataset is id 1 and carries the wavelength", "[write_reflections][portable]") {
     jfjoch_test::SyntheticMergeParams params;
     params.true_space_group = "P 43 21 2";
     params.twin_supergroup = "P 43 21 2";
@@ -74,7 +74,7 @@ TEST_CASE("Merged MTZ: the data dataset is id 1 and carries the wavelength", "[w
 }
 
 TEST_CASE("Unmerged MTZ: LP is Lorentz-polarization, QE the sensor efficiency, FLIGHT the flight path",
-          "[write_reflections]") {
+          "[write_reflections][portable]") {
     // The whole point of the split: LP must mean what XDS and DIALS mean by it, and the raw count
     // sum must still be recoverable from the file alone, as I / LP * QE * FLIGHT.
     auto experiment = TestExperiment();
diff --git a/tests/ZSTDCompressorTest.cpp b/tests/ZSTDCompressorTest.cpp
index 5a497601e..f6f3e3575 100644
--- a/tests/ZSTDCompressorTest.cpp
+++ b/tests/ZSTDCompressorTest.cpp
@@ -229,7 +229,7 @@ TEST_CASE("JFjochZstdCompressor_Frame_ones","[ZSTD]") {
     REQUIRE(memcmp(input_shuffled.data(), output.data(), RAW_MODULE_SIZE * sizeof(uint16_t)) == 0);
 }
 
-TEST_CASE("JFJochCompressor_JFJochDecompressor_ZSTD","[ZSTD]") {
+TEST_CASE("JFJochCompressor_JFJochDecompressor_ZSTD","[ZSTD][portable]") {
     DiffractionExperiment x(DetJF4M());
     x.Compression(CompressionAlgorithm::BSHUF_ZSTD).BitDepthImage(32).PixelSigned(true);
 
@@ -269,7 +269,7 @@ TEST_CASE("JFJochCompressor_DestTooSmall_Throws","[ZSTD]") {
     REQUIRE_NOTHROW(compressor.Compress(big.data(), big.size(), image));
 }
 
-TEST_CASE("JFJochCompressor_JFJochDecompressor_LZ4","[ZSTD]") {
+TEST_CASE("JFJochCompressor_JFJochDecompressor_LZ4","[ZSTD][portable]") {
     DiffractionExperiment x(DetJF4M());
     x.Compression(CompressionAlgorithm::BSHUF_LZ4).BitDepthImage(32).PixelSigned(true);
 
@@ -396,7 +396,7 @@ TEST_CASE("ZstdHuff_MaskLike", "[ZSTD]") {
     RequireHuffRoundTrip(image);
 }
 
-TEST_CASE("ZstdHuff_BenchmarkImage", "[ZSTD]") {
+TEST_CASE("ZstdHuff_BenchmarkImage", "[ZSTD][portable]") {
     RegisterHDF5Filter();   // bitshuffle filter, needed to read the compressed benchmark dataset
     HDF5ReadOnlyFile data("../../tests/test_data/compression_benchmark.h5");
     HDF5DataSet dataset(data, "/entry/data/data");
diff --git a/tests/data/README.md b/tests/data/README.md
index 3227cd93b..b1353efcf 100644
--- a/tests/data/README.md
+++ b/tests/data/README.md
@@ -23,7 +23,8 @@ git lfs pull            # or: git lfs pull --include "tests/data/*.h5"
 | `rotation_master.h5`       | protein rotation series (~1800 images)  | yes (LFS) |
 
 `rotation_master.h5` (plus its `_data_NNNNNN.h5` files) is fetched by `git lfs pull` and
-drives `Rugnux_Rotation`. A separate serial dataset is intentionally **not** shipped
+drives `Rugnux_Rotation`, and its first four frames `Portable_Rugnux_RotationWedge` (the
+`[portable]` end-to-end check, which skips on the macOS/Windows jobs because they do not pull LFS). A separate serial dataset is intentionally **not** shipped
 to keep the repository small — the rotation series can be run in serial mode (full analysis
 without rotation indexing) to exercise that path. To add your own dataset, drop the master + its
 data files here as real files (not symlinks, if you intend to commit them via LFS); the master