The point-group self-consistency comments named specific datasets when
illustrating the chi^2-ratio / systematic-b calibration. Describe the
crystallographic situation instead (a merohedral R3->R32 twin, a genuine
cubic step, a tetragonal P41212 case), per the repository's no-sample-names
rule. Comment-only; no behaviour change.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>