leonarski_fandClaude Opus 5
2c94f3013e
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The per-image mosaicity MLE ran over the whole indexed spot list, so it rode on --max-spots, which is an indexing budget. A spot is detected when I_full * R(tau) clears the finder threshold, so selecting by intensity censors on R(tau): a deeper list holds proportionally more large-|tau| partially recorded spots and the fit widens with it. Raising the budget 250 -> 1000 widened sigma_M 0.059 -> 0.075 deg on a rotation dataset whose measured rocking width says 0.054. That is not cosmetic. An over-wide mosaicity mis-states every partiality in scaling: forcing the mosaicity across that range moved the merge error model from b 0.039 / ISa 26 to b 0.167 / ISa 6, and the space-group search lost a genuine 422 with it, merging the crystal in 222 instead. Cap the fit at the strongest 250 spots. FilterSpotsByCount leaves the list strongest-first, so this selects exactly the spots a smaller --max-spots would, and the mosaicity becomes invariant: 0.0538 deg at 250, 500, 1000 and 2000 spots, with the correct space group at each. Trimming or down-weighting the tau tail does not work - the censoring is multiplicative in R(tau), so it widens the whole distribution rather than adding a tail. Battery over 37 crystals: exactly one change, the demoted crystal repaired (33 space groups matching XDS -> 34). 23 of 37 are bit-identical, never reaching 250 spots. Unaffected elsewhere: the default spot count is 250, and stills have no goniometer so they return before the fit. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
