Smoothing the per-frame scale inside the loop runs before the guard that drops frames whose scale
collapsed, and the window is a geometric mean - so a frame the crystal did not diffract on was both
dragging its whole window down by its logarithm and being lifted toward its neighbours, which is how
it escaped the guard meant to drop it. Measured: on sweeps with a genuinely dead stretch the guard
went from eight fires at up to a million times below the median to five at six hundred times, and on
a long clean sweep with a dead block from six fires to none.
A frame already below the guard's floor is now left out of every window and keeps its own fitted
scale, so what reaches the guard is the scale the fit produced. The floor is the guard's own, read
the same way - no new criterion and no new constant.
The guard's fires come back where the fit still collapses those frames (on the two dead-stretch
sets to seven and six, at up to three and seven million times below the median; on the long clean
sweep to six, the count it had before), and with them the error-model asymptote: ISa 7.9 back to 9.2
on one dead-stretch set, 36.7 to 38.0 on the clean one. Where the restraint stops the fit from
driving a frame below the floor at all there is nothing to exclude and nothing changes. No result
moves the wrong way: the fine-sliced, small-cell and powder sets keep the merges the restraint
recovered - two of them improve, one by CC1/2 0.916 to 0.943 - and every space group is unchanged,
including the short-sweep tetragonal pair and the de-novo orthorhombic set the loop was fixed for.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_013nW6FNRP1bBJJ8pfHiByAT
leonarski_fandClaude Opus 5
8ecaba1341