The pass-1 post-refinement fits the rotation scale k only on the frames the stored angles still
track, and a rate error is exactly what stops them tracking the rest: on a sweep whose stage turned
~3 % slow the fit read 0.979 over 94 deg, failed its leave-a-fifth-out test and was thrown away,
leaving half the frames unscaled.
The pass no longer decides. Between the passes, at the pass-2 detector geometry, the lattice is
indexed (index-only probe) under the stored angles and under the fitted k and scored on the
validation frames of the whole sweep: share of the spots on the lattice beyond the wrong-spindle
null. k is adopted only where it scores higher by more than the binomial noise of the two
(ValidationEvidencePrefers - the test the beam-centre arms already used, now one function); the
run then integrates and post-refines at k (post-refine-only probe), fits again on top of it and
repeats until the next k no longer scores better (WalkRotationScale). The stored angles are the
first hypothesis. Measured: 1.000 25.1 %, 0.97874 58.9 %, 0.97041 90.0 %, 0.97006 90.7 % (not
significant) -> 0.97041 adopted.
Probes restore the experiment, the pass-2 geometry, pass-1 mosaicity and the beam-centre-search
flag; a probe opens no beam-centre search. Forced pass-1 results get their axis scaled; the header
revert drops the scale. GONIOMETER_ROTATION_SCALE reports the adopted k (SUSPECT = adopted). The
leave-a-fifth-out figure stays in the log only.
Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01D1G8gJVAy6gp1K5Dz3NE5C
leonarski_fandClaude Opus 5.5
032bf9fe2b