Per-operator CC alone cannot separate a real weak symmetry operator from a false
moderate one: a noisy crystal's genuine cubic 2-folds (InsI2 I23, CC ~0.51) score
BELOW a pseudo-symmetric crystal's false 2-fold (InsH3, CC 0.64), so no CC threshold
works. Add a self-consistency test: a candidate point group is accepted only if
merging the intensities under it does not inflate R-meas past max_rmeas_ratio (1.5x)
the most-consistent candidate. A false operator forces non-equivalent reflections
together and blows R-meas up; a real one leaves it flat.
Fixes InsH3: was over-called R32 (ISa collapsed to 2.2 from the forced merge), now
correctly R3/H3 (ISa 10.2, matching XDS). InsI2 stays I23, and lysoC/InsI3/MyoB/
EP0210/cytC/lyso_ref are unchanged.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
leonarski_fandClaude Opus 4.8
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