leonarski_fandClaude Opus 4.8
ed9f6ac9eb
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An 11-crystal mosaicity-stratified re-test (/data/rotation_test, off vs on vs a de-contaminated variant, plus a per-frame dump of the fitted widths) showed the dial is net-negative and cannot work in the per-frame paradigm: - The C|q|^2 mosaicity term - the whole point - is unfittable per-frame: the fitted curvature a2 comes out ~0 (often negative) on every crystal, with zero correlation to the XDS mosaicity (0.09..0.42 deg). Strong spots sit at low q where eta^2 q^2 is invisible; the curvature only appears at high q where there are ~0 strong spots. The law degenerates to a straight line. - With a2~0 the high-res width becomes a blind 1/cos^2(2theta) extrapolation, 2-4x wider than per-shell. The per-shell path's high-res "starvation" (flat narrow fallback) is accidentally correct: weak, crowded high-res spots want a narrow aperture, not the true wide spot shape. - The over-wide profile pulls background into weak spots -> R-meas rises, CC1/2 drops in reliable high-multiplicity shells (pding4_001, pding4_003, MyoB, EcwtCQ066). A cap at the widest well-sampled per-shell width recovers the regression, confirming over-widening is the harm. No crystal reliably wins; the apparent overall-CC gains were all in noise shells (mult 2-3, CC<20%). Delete the CLI flag, the BraggIntegrationSettings::reciprocal_profile setting, and the per-frame fit block. Default (per-shell) integration is byte-identical. NEXTGEN_INTEGRATOR.md records the finding as a dead-end for posterity. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
