Stage A offered the b-unique two-fold (reference setting) on the lattice's holohedry alone, but held
its a- and c-unique siblings (pass-1 settings) to CellHostsRotations at 2e-3. On a cell refined free
~0.2 deg off orthogonal only the b-unique rung existed, so when the holohedral 222 was refused the
setting, not the data, chose the two-fold axis. Stage B already offers non-reference settings
without asking the cell, for the same reason; Stage A now does likewise where a holohedry is given.
With siblings of one order eligible together, ties were broken on the class CC alone, which a twin
law at fraction ~0.4 can win. A twin law cannot extinguish an axial row (every principal row maps to
itself or its Friedel mate), so ties now go first to the group whose pure two-fold axes carry the
more screw evidence on their own odd axial row - judged exactly as Stage B judges that zone - and
only then to the CC. Rows on 3-, 4- or 6-fold axes are not read.
Open arm: 6p8j (deposited P2_1, b = 152 A) was P 1 1 2 on the 88 A axis, now P 1 21 1 on the 152 A
axis (152 A odd row 158 nats, 46 A row 36, 88 A row refused; R-free 0.214). 9hnc and 5cc8 p.mtz
md5-identical (siblings offered but refused by added-operator R). On five passing P2_1 sets in an
orthorhombic metric the true axis carries all the evidence (offline replay), so no change there.
Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01SVmAWnzCmRKAXVUCdc4iNi
leonarski_fandClaude Opus 5.5
8880e95382