Jungfraujoch/docs/RUGNUX_REPORT.md

The results report

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<prefix>_report.txt records what the run determined, next to the reflection files. It is written on every --mode mx and --mode scale run that has an output prefix — there is no option to enable or disable it. Two cases follow from that:

• An empty output prefix (-o "", the "compute the statistics, persist nothing" mode) writes nothing, the report included.
• --no-merge still writes a report. It determined an indexing and a geometry result, and those are recorded; the merging section then says MERGE= NOT_PERFORMED rather than being omitted, so the absence is a statement and not something a reader has to infer.

The report is never allowed to fail a run: if it cannot be written (unwritable path, full disk) the failure is logged as a warning and the run finishes normally.

Exit status. rugnux exits 0 when the run completed — everything it determined, declined to determine (CANNOT_DETERMINE) or warned about is in the report — and non-zero when the run stopped: unreadable input, no usable lattice, a -S group the indexed lattice cannot host, an indexer that could not run. The reason goes to the terminal, and the report may not exist in that case — so a script branches on the exit status first and greps the report second.

Format

The model is XDS's CORRECT.LP: prose and tables a crystallographer reads top to bottom, with a structure a script can consume without parsing prose.

• KEY= value assignment lines. Every number worth extracting is one, so a consumer gets it with a single grep '^ISA= ' and never has to read a sentence. Key names are stable.
• Fixed-width tables with a stable header row for anything that is genuinely tabular — the resolution shells, the space-group candidates, the sweep-quality ranges.
• WARNING: lines, one per finding, in plain English: WARNING: Frames 500-600 out of beam (10.1 deg, scale 0.12 and CC 0.30 of the run, 2% scaled). grep '^WARNING:' finds every one.
• Section banners (***…*** around a numbered title) delimiting the blocks.

A quantity the run did not measure writes no key at all, and the fixed-width tables print - in its place. There is one rule and no placeholders — no nan, and no 0.0% that reads as a measured total failure — so a consumer must treat an absent key as not measured rather than assume every key it knows about is present. A measured value always prints, including a negative one. The keys a script meets this on first are SIGANO= and CC_ANOM=: a rotation merge measures them whether or not -A was given, but where no Bijvoet pair could be split in both hands — a stills merge without -A, or too few pairs — the quantity does not exist and the key is absent; COMPLETENESS=, MULTIPLICITY=, I_OVER_SIGMA=, R_MEAS=, CC_HALF= and WILSON_B= follow the same rule.

The last block before END OF REPORT is the acknowledgement — the crystallographic methods rugnux implements were published by the X-ray research community and the program is built on open-source software from many projects, both credited in ACKNOWLEDGEMENT.md beside LICENSE and THIRD_PARTY_NOTICES.md in the installed package. rugnux prints the same lines at startup.

REPORT_VERSION= is the format's own version. Key names, table columns and the reason vocabulary below are an interface other software may depend on: they do not change without that number moving. Adding a key does not move it — a consumer that greps for what it needs is unaffected by one more line.

The header block above section 1 records how the result was produced: RUGNUX_VERSION= and RUGNUX_GIT=, DATE=, INPUT_FILE= and OUTPUT_PREFIX=, plus

• COMMAND_LINE= — the invocation as one shell-ready line, arguments containing spaces quoted.
• WALL_TIME= — the whole invocation in seconds. It covers everything the process did, opening the file and setting up included, so it is a little larger than the Processing time printed on stdout, which starts once the analysis does.
• GPU_COUNT= and GPU= — how many GPUs were visible and what they are, e.g. GPU= 4x NVIDIA A100-SXM4-80GB; several models on one machine are listed as separate groups. GPU_COUNT= 0 appears on its own, with no GPU= line, when nothing was visible — which is the first thing to check when a run took far longer than expected. rugnux prints the same line at startup, before the run, so a missing GPU can be caught while there is still time to stop.

Rates, per-image costs and progress remain on stdout only.

Sections, in order: the SUMMARY, then 1. DATA SET AND GEOMETRY, 2. CRYSTAL, 3. MERGED DATA, 4. DIAGNOSTICS, and 5. MODEL VALIDATION only with --model (see The summary below). The numbering is contiguous, and the fifth section appearing renumbers nothing; a stage that did not run states that inside its section — MERGE= NOT_PERFORMED — rather than the section disappearing.

SPOT_RESOLUTION_ESTIMATE= in section 1 is how far the merged data are expected to reach, read off the found spots alone — no lattice, no integration, no merge — so it is there on a run that never merges, and on a run that does it can be read against INCLUDE_RESOLUTION_RANGE in section 3. It is a prediction, good to about 0.2 Å on rotation data; nothing is cut on it. It is not limited to what the detector records: where it reads finer than the high-resolution end of INCLUDE_RESOLUTION_RANGE, the crystal diffracts past the corner and the run was detector-limited.

JFJOCH_DATASET_SETTINGS= in section 1 is the geometry the run integrated at — on a rotation run the post-refined one — written as the object jfjoch_broker takes it in: the four required properties of dataset_settings in broker/jfjoch_api.yaml, joined by the three poni_rot*_rad angles whenever any of them is non-zero (a body without them states a flat detector), on one line of valid JSON, so a refined beam centre and distance can go back to the instrument for the next collection without anyone retyping them.

JFJOCH_DATASET_SETTINGS= {"beam_x_pxl": 2078.24, "beam_y_pxl": 2233.92, "detector_distance_mm": 190.311, "incident_energy_keV": 12.4000}

grep '^JFJOCH_DATASET_SETTINGS=' out_report.txt | cut -d' ' -f2- > geometry.json

Which pass. A rotation run integrates twice — once at the geometry in the input file, then again at the post-refined geometry — and can integrate a third time if a guard rejects the second pass. There is one report, for the pass that became the canonical output, and PASS= / PASS_DECISION= (--developer) in section 1 say which pass that is and on what evidence, so no number in the file is ambiguous about which geometry produced it.

Not in the report: timing, frame rates, thread counts, per-image progress and library banners. Those are process, not result, and stay on stdout.

The summary, and what the run decided

The file opens with a SUMMARY section, above everything it summarises. It exists because the report used to have no evaluative line anywhere until its last section: a run that produced garbage and a run that produced a textbook data set read identically for their first three hundred lines.

• VERDICT= is a closed vocabulary — OK, WARNINGS, UNUSABLE, FAILED. FAILED means no lattice was determined or the run was cancelled; UNUSABLE means the data merged but carry no usable signal; WARNINGS means something else needs attention; OK means nothing did. It is decided from the warnings the rest of the report produced, so it introduces no new analysis and cannot disagree with the sections below it.
• VERDICT_TEXT= is one to three sentences of free text saying the same thing in English.
• PATHOLOGY_FLAGS= is the type of each condition that fired, from a closed vocabulary, so a consumer switches on a code rather than parsing a sentence: NO_LATTICE, INDEXING_AMBIGUITY, SYMMETRY_AMBIGUITY, CENTERING_UNTESTED, UNUSABLE_MERGE, LOW_COMPLETENESS, SWEEP_GAPS, GONIO_SCALE, SPINDLE_CAP, ANISOTROPY, TWINNING, PSEUDO_TRANSLATION, LATTICE_TRANSLATION, MODEL_HAND, MODEL_NOT_VALIDATED, CANCELLED, RESOLUTION_FIT, FLIGHT_PATH. NONE when nothing fired. A code appears if and only if its warning fired, so the flags and the WARNING: lines are two renderings of one list — the closed type for machinery, the open sentence for a person.
• WARNING_COUNT= and the WARNING: lines follow, in the same section. They are what they always were; they have moved from the bottom of the file to the top.

Then four sections, numbered contiguously: 1. DATA SET AND GEOMETRY, 2. CRYSTAL, 3. MERGED DATA, 4. DIAGNOSTICS, and 5. MODEL VALIDATION only with --model.

The developer report

--developer renders the same report in full. The default report carries what a person deciding keep or recollect acts on; --developer adds the pipeline's own internals — the anisotropy detection gate's parameters, the space-group operator and candidate tables, the model-fit null, the sweep-quality internals, the twinning statistics measured before the search, and the long explanatory passages — plus advisories about the cut's own behaviour that no user can act on.

Nothing is computed differently and nothing is lost by leaving the flag off: the report is built once, in full, and the flag selects how much of it is written. Every key the default report writes, --developer writes too.

The space group, and the Sohncke answer beside it

The space group lives in section 2: SPACE_GROUP_NAME= / SPACE_GROUP_NUMBER=, with SPACE_GROUP_ALTERNATIVES= naming the candidates the data could not separate — an enantiomorphic partner among them — and, on a group that has such a partner, SPACE_GROUP_ENANTIOMORPH= saying whether the hand is open (UNDETERMINED), asserted by the user (GIVEN), or taken from an accepted model (ASSUMED_FROM_MODEL).

SOHNCKE_SPACE_GROUP= in section 2 is written on every run whose space group was determined by the search; a run given its group with -S has no Sohncke candidate to name and omits the key. Where the search found a glide plane, SPACE_GROUP_NAME= names the group with it and this names the best group without - a crystal of chiral molecules, which is any protein, cannot have a glide plane or an inversion centre, so a reader who knows their sample is a protein reads this key and needs no second run. Where no glide was found the two keys read the same, deliberately: greppability is the point, and a key that appears only sometimes has to be tested for before it can be read.

Sweep quality and the reason vocabulary

Section 4 lists the stretches of the sweep over which the crystal delivered much less than the rest of the run — the feedback a beamline control system needs to tell an operator that a crystal should be recentred or recollected. Nothing is excluded on the strength of it; the frames still carry signal, and this is a message for the beamline, not a filter.

SWEEP_QUALITY_STATUS= COMPUTED
SWEEP_QUALITY_COUNT= 1
SWEEP_QUALITY_REASONS= no_diffraction crystal_out_of_beam weak_diffraction loss_of_centring radiation_damage
SWEEP_ROTATION= 360.0
FLUX_PEAK_TO_TROUGH= 1.03
SCALE_MODULATION_PEAK_TO_TROUGH= 1.00

  FIRST_IMAGE   LAST_IMAGE   N_IMAGES  ROTATION  REASON                SEVERITY   SCALE      CC   INDEXED
  -----------  -----------  ---------  --------  --------------------  --------  ------  ------  --------
          500          600        101      10.1  crystal_out_of_beam       0.83    0.12    0.30      0.02
  -----------  -----------  ---------  --------  --------------------  --------  ------  ------  --------

Of those keys, only SWEEP_QUALITY_COUNT is in the default report; SWEEP_QUALITY_STATUS, SWEEP_QUALITY_REASONS, SWEEP_ROTATION, FLUX_PEAK_TO_TROUGH and SCALE_MODULATION_PEAK_TO_TROUGH appear with --developer (the default report states in prose whether the diagnostic ran).

SWEEP_QUALITY_STATUS distinguishes COMPUTED (the diagnostic ran; a count of 0 means the sweep was clean throughout) from NOT_COMPUTED (it did not run — no scaling and merging, or stills data). A consumer must not read a missing table or a zero count as "clean" without checking it. SWEEP_QUALITY_REASONS lists the whole vocabulary this version can emit, so an unknown code is distinguishable from a missing one.

Reason code	Meaning
no_diffraction	The range recorded essentially no diffraction from the indexed lattice.
crystal_out_of_beam	Frames were lost: over the range a per-image scale could be fitted far less often than over the run.
weak_diffraction	The frames all still index, but with much less intensity — the cause was not determined.
loss_of_centring	One cycle of modulation per revolution: the crystal is off the rotation axis.
radiation_damage	The range runs to the end of a sweep whose quality was already decaying.

The vocabulary is closed and stable: a code is never renamed, and never reused for a different meaning. New codes are only ever added, and adding one moves REPORT_VERSION.

The columns are: FIRST_IMAGE/LAST_IMAGE — inclusive, in processed-image ordinals (the numbering of <prefix>_image.dat and of every other per-image array rugnux writes; with -s/--stride the source image is start + ordinal * stride); ROTATION — the width of the range in degrees; SEVERITY — the fraction of the run's typical diffracting power missing over the range, 0 (as good as the run) to 1 (nothing at all); SCALE and CC — the range's mean per-image scale and CC-to-merge relative to the run median; INDEXED — the fraction of the range's frames that were scaled at all. Every range also appears as a WARNING: sentence in the SUMMARY.

The same finding is written per image into the _process.h5 as /entry/MX/sweepQuality, when one is written — see HDF5.

Translational pseudo-symmetry

Two copies of the contents of the asymmetric unit related by a pure translation that is not a lattice vector. It is the pathology that most reliably breaks molecular replacement, because the modulation it puts on the intensities is not in the search model. Section 4 reports it beside twinning, because the two interact. The algorithm is in CPU/GPU data analysis ▸ Twinning and translational pseudo-symmetry.

TNCS_DETECTED= is TRUE, FALSE, INCONCLUSIVE or NOT_MEASURED. The last two are not FALSE: NOT_MEASURED means the merge has too few reflections in 20–5 Å to compute the statistic at all, INCONCLUSIVE means the Patterson was measured but too few acentric reflections remain to test whether the vector it names modulates the intensities. Neither is a statement that the crystal has no pseudo-symmetry.

TRUE requires both of two tests, because either alone over-calls by about a factor of two:

• TNCS_PATTERSON_PEAK_PCT= — the largest off-origin peak of the native Patterson, as a percentage of the origin peak, counting only peaks farther than 15 Å from any origin-equivalent lattice point. TNCS_PATTERSON_PEAK_Z= scores it against TNCS_PATTERSON_NULL_PCT=, the same map recomputed with the intensities permuted within resolution shells. The null is per dataset and not a table: the noise floor of this statistic runs from about 1% on a large merge to about 18% on a small one, so no fixed percentage separates the two populations.
• TNCS_MODULATION= — the ratio of the strongest to the weakest bin mean of ⟨E²⟩ over the phase frac(h·u), with u the refined peak vector (TNCS_VECTOR=, fractional, and TNCS_VECTOR_LENGTH= in Å). TNCS_MODULATION_NULL= is the same search started from random vectors, so the contrast the search itself can manufacture is measured rather than assumed.

The vector is good to about 0.05 fractional. It is a starting point for a program that refines it, not a refined result: the refinement maximises the modulation, not the accuracy of the vector.

TNCS_PSEUDO_CENTRED= and TNCS_SUBLATTICE= are separate claims and are deliberately not merged. A vector that is a rational translation 1/q of the cell means the crystal is pseudo-centred; the cell itself is not in question, because the suppressed class is weak rather than absent and a smaller cell would contradict it. Only TNCS_SUBLATTICE= NEAR_EXTINCT_CLASS — the suppressed class almost gone — says the reported cell may be a supercell.

UNDECLARED_LATTICE_TRANSLATION= is a different finding, and is reported instead of a pseudo-symmetry rather than as one. The merged data are exactly invariant under the translation, and a translation the data are exactly invariant under is a lattice vector by definition — so the centring or the cell is wrong, not the packing. It is what a centred lattice merged in P1 looks like, which --mode scale on a file with no space group produces by design. The pseudo-symmetry search continues underneath it, so a real pseudo-translation sitting under an undeclared centring is still found.

L_TEST_VS_TNCS= says how the twinning L-test beside it coped. A pseudo-translation u biases ⟨|L|⟩ upwards unless the partner reflection at h + s shares its class, which happens exactly when s·u is an integer; a half-integer u — a pseudo-centering — is preserved by the ordinary axis step of 2 and reads UNAFFECTED. Where it is not, the steps are restricted to those that do preserve the class (REPAIRED), and where no step does, UNREADABLE says the statistic was dropped from the twin verdict in both directions: it can no longer indicate a twin, and it can no longer be read as proof that there is none. The second moment then decides alone.

Diffraction anisotropy

Section 4 also reports how much the fall-off with resolution depends on direction, and whether that is established above the data set's own systematic error. It runs automatically on every merging run — there is no flag — and it is a description only: no intensity is corrected, no reflection is removed on a directional criterion, and the merged data and the written reflection files do not depend on direction at all. The algorithm is in CPU/GPU data analysis ▸ Diffraction anisotropy.

Two different quantities are reported and they are not interchangeable. ANISOTROPY_DELTA_B is a rate — the range of the principal components of the anisotropy tensor, on the ordinary crystallographic B scale, so it is directly comparable with phenix.xtriage's B_cart, ctruncate's anisotropic B and AIMLESS's anisotropic ΔB. ANISOTROPY_D_MIN_PRINCIPAL is where the signal actually runs out along each principal direction. A crystal can have a large ΔB and almost no spread in directional limit, or the reverse.

key	meaning
ANISOTROPY_VERDICT	DETECTED | NOT_DETECTED | CANNOT_DETERMINE
ANISOTROPY_FREE_DIRECTIONS	Deviatoric directions the Laue class allows — 5 triclinic, 3 monoclinic, 2 orthorhombic, 1 tetragonal/trigonal/hexagonal, 0 cubic
ANISOTROPY_DELTA_B	The anisotropic ΔB (Ų), fitted on intensities with nothing dropped
ANISOTROPY_DELTA_B_LINEAR	The part of it that follows exp(−½ sᵀBs). This is the number the verdict is gated on, and the report says which of the two it is quoting
ANISOTROPY_PRINCIPAL_B	The three principal components, relative to the weakest
ANISOTROPY_D_MIN_PRINCIPAL	Diffraction limit (Å) along each principal direction — where ⟨I/σ(I)⟩ in a 20° cone about it falls through 2
ANISOTROPY_D_MIN_CENSORED	One flag per direction. 1 means ⟨I/σ(I)⟩ never fell through 2, so the limit is the edge of the measured data, a bound and not a measurement. The prose marks it with a <
ANISOTROPY_D_MIN_SPREAD	Range of the three limits — itself a lower bound if any is censored
ANISOTROPY_SHAPE	LINEAR (a real Debye–Waller B) | FLAT (the deficit does not follow a B at all, so ΔB may be an under-estimate) | CONVEX (grows faster than a B can) | UNDETERMINED (the verdict moved on rebinning)
ANISOTROPY_FLOOR, ANISOTROPY_SIGNIFICANCE	The data set's own systematic-error floor (Ų) and ΔBlinear over it. Banded: below 2 not established, 2–3.5 marginal, above 3.5 established, above 5 strong
ANISOTROPY_DETECTION_LIMIT	The smallest ΔB that could have been established on these data. It is set by systematic error, not by counting, so it does not improve with more reflections or a longer exposure
ANISOTROPY_N_OBSERVATIONS, ANISOTROPY_FORBIDDEN_Z, ANISOTROPY_SIGMA_SYSTEMATIC	The unmerged observations the floor was measured on, that measurement against its own counting noise, and the floor before the counting part is added back

The default report carries ANISOTROPY_VERDICT, ANISOTROPY_DELTA_B, ANISOTROPY_D_MIN_PRINCIPAL and ANISOTROPY_D_MIN_SPREAD; the rest of this table — the detection gate's own parameters — is written with --developer.

CANNOT_DETERMINE is a real answer, not an evasion. The verdict is not measured against counting statistics — real data carry systematic error far larger than that, and gating on counting error reports anisotropy on data sets that have none. Instead the data set measures its own systematic error in the tensor directions its Laue class forbids, where the true value is exactly zero whatever the crystal is. Where that measurement cannot be made, the run says so and gives the reason: a triclinic Laue class (no forbidden direction exists), an observed rotation under about 90°, merged data at the noise floor, a scale model carrying no dose term (--no-scaling-corrections), or no unmerged observations. A cubic Laue class is different again — symmetry forces ΔB to be exactly zero, and the run says that rather than reporting a measurement.

Where anisotropy is detected and the directional limits differ by more than 0.5 Å, a WARNING: line says so, since refinement and map interpretation should allow for it.

Model validation

Section 5 appears only with --model. It reports the supplied model against the merged data — R-factors, maps, anomalous sites — and, separately, whether the data accepted the model at all.

The two are not the same question, and the report keeps them apart. The R-factors, the maps and the rigid-body placement describe the model: they are computed and reported whatever the answer, because a model that does not belong to this crystal still has an R against it, and that is the negative result. MODEL_FIT= is the answer, and it is what governs whether the model was allowed to change anything about the written reflections.

There is no threshold on R behind it. What a model that explains nothing reaches against a given data set depends on its atom count and B-factors as much as on the data, so the same model is refitted — and re-placed as a rigid body, exactly as the real one is — from MODEL_FIT_NULL_REPLICATES random orientations about its own centroid, and MODEL_FIT_SIGMA is how far the real fit sits above that distribution. The statistic is R-work, not R-free - not because nothing is refined against the working set (the placement's six parameters are), but because every null replicate is placed the same way, so what they buy is bought on both sides and cancels; and it is decided on an order of magnitude more reflections than R-free.

That null is only built where the model claims one of the two things it could change — the enantiomorph, or an indexing other than the one the data were merged in. A model already in the data's space group on a crystal with no merohedral ambiguity, which is the isomorphous case a screening campaign is made of, claims neither: MODEL_FIT= NOT_TESTED, MODEL_DECISIONS_TAKEN= NONE, and the run does not pay for a null that would gate nothing. NOT_TESTED is not REJECTED — it says the question was never put, not that the data answered it badly — and the three values are distinguishable by grepping the one key. The MODEL_FIT_NULL_* and MODEL_FIT_SIGMA keys are absent in that case, since there is no null to report; R_WORK, R_FREE, the maps and the rigid-body shift are all there as usual.

key	meaning
MODEL_VALIDATION	PERFORMED | NOT_PERFORMED (with MODEL_VALIDATION_REASON, and no R-factors)
MODEL_FIT	ACCEPTED | REJECTED | NOT_TESTED — whether the model may decide anything, or had nothing to decide
MODEL_FIT_STATISTIC	What the verdict was taken on; R_WORK
MODEL_FIT_VALUE, MODEL_FIT_NULL_MEAN, MODEL_FIT_NULL_SD, MODEL_FIT_NULL_REPLICATES	The real fit, and the null of the same model in random orientations. Absent when NOT_TESTED
MODEL_FIT_SIGMA	The real fit above that null, in its standard deviations. Signed. Absent when NOT_TESTED
MODEL_DECISIONS_TAKEN	NONE | ENANTIOMORPH | INDEXING | ENANTIOMORPH+INDEXING
MODEL_ENANTIOMORPH_ADOPTED, MODEL_INDEXING_OPERATOR	The two decisions individually; x,y,z is no reindexing
MODEL_INDEXING_MARGIN, MODEL_INDEXING_MARGIN_NULL, MODEL_INDEXING_MARGIN_SIGMA	Present only where a merohedral ambiguity was probed. The winner's lead over the runner-up in R-free, against the lead a random placement of the same model produces

The null's own numbers — MODEL_FIT_STATISTIC, MODEL_FIT_VALUE, the MODEL_FIT_NULL_* keys and the MODEL_INDEXING_MARGIN* keys — are written with --developer; the default report carries the verdict (MODEL_FIT, MODEL_FIT_SIGMA, MODEL_DECISIONS_TAKEN and the two decisions).

CC(model, data)

Beside the R-factors, section 5 carries the correlation of the merged intensities with the placed, scaled model, |F_model|², by resolution shell. The shells are the merge table's own, so a row here can be read straight across from that shell's CC_1/2 and R_meas in section 3. It is a correlation of intensities, like CC_1/2 and CCref beside it, and the observed value is the merged intensity itself rather than the French–Wilson |F|² the R-factors use — that amplitude is a posterior mean under a Wilson prior, which pulls a weak reflection towards its shell mean and would show up as correlation in exactly the outer shells this number is read in.

Nothing here was refined against these reflections — the model is placed and scaled with eleven parameters — so there is no work/free distinction to draw: the correlation is unbiased on all the reflections of a shell, not only the few hundred free ones, and SIGMA is correspondingly sharp.

key	meaning
CC_MODEL_OVERALL, CC_MODEL_REFLECTIONS	The correlation over every reflection in the table, and how many — the N column sums to it. Like any overall correlation it is shell-weighted and can take any value between the best shell and the worst; the table is what to read
CC_MODEL_CONFIRMED_TO_D_MIN	The finest shell whose correlation reaches 3 σ, or NONE. A lower bound on the useful resolution
the D_MIN / CC_MODEL / N / SIGMA table	Per shell: the correlation, the reflections it was formed on, and how far above zero it sits (Fisher's transform, atanh(CC)·√(N−3))

Read it in one direction only. A shell whose correlation is significantly above zero carries signal — a model cannot agree by accident with measurements it was never fitted to — so CC_MODEL_CONFIRMED_TO_D_MIN is evidence for keeping more data. A shell whose correlation is near zero says nothing about the data: the model may be incomplete, in the wrong hand, or simply wrong for this crystal, and cutting on it would be cutting because the model is poor. Nothing in the pipeline acts on these numbers; they are reported and no more. This is the same asymmetry cryo-EM works under, where the half-map FSC sets the resolution and the model–map FSC only validates it.

A significantly negative correlation in a shell is worth chasing rather than ignoring: it cannot be signal, so it points at a systematic error — an indexing the model disagrees with, or an outer shell the scaling has mistreated.

MODEL_DECISIONS_TAKEN= NONE — whether the model was rejected or never tested — means the reflection files are byte for byte what a run with no model would have written — same space group, same indexing, same .mtz, .cif, .hkl and _unmerged.mtz. A rejected model is therefore safe to try: it costs the null's compute and changes nothing else.

SPINDLE_SYMMETRY_AXIS_ANGLE_DEG= and SPINDLE_SYMMETRY_AXIS_ORDER= (--developer) in section 4 say how the crystal sat on the goniometer: the angle between the spindle and the nearest symmetry axis, and that axis's order. They are descriptive: neither convicts nor clears the mounting on its own, because an aligned axis of any order maps the sweep's blind cone onto itself while an axis near perpendicular does the same only when it is a lone 2-fold, and only the nearest axis is reported. (New in REPORT_VERSION= 7.)

SPINDLE_LOST_UNIQUE_FRACTION= in section 4 is the exact verdict the angle cannot give: the fraction (0-1, so 0.0300 means 3%) of unique reflections, to this run's resolution limit, that the mounting made unmeasurable - the part of the sweep's blind double cone that no operator of the measured point group maps onto measured territory, computed in the crystal's actual indexed orientation. 0.0000 means the mounting cost nothing; the run warns when the group recovers less than half of the cone's content. The same number is written to the master file as /entry/MX/spindleLostUniqueFraction, so a pipeline can read it from either output without parsing prose. Written on every rotation run that determined a space group and merged reflections.

SPACE_GROUP_ENANTIOMORPH= in section 2 reads ASSUMED_FROM_MODEL when the hand written in the files is the model's. Assumed, not determined: merged intensities cannot see the hand at all — |F| is invariant under the change of hand — so an accepted model asserts it out of prior chemical knowledge. It is only ever written where MODEL_FIT= ACCEPTED, and the anomalous difference map vetoes it outright where the map says the model and the data are in opposite hands. (Before REPORT_VERSION= 6 this value was spelled DETERMINED_FROM_MODEL and was emitted whenever a model file merely parsed.)