Leaving it at G = 1 looked like the conservative choice and is the more damaging
of the two errors. The per-image scale enters as rlp/(partiality*G) and multiplies
intensity and sigma alike, so substituting 1 for a scale that was really 1/200 of
the run median puts the intensities in 200x too low with sigmas 200x too low too -
1/G^2 times the weight they deserve. The merge cannot defend itself against that,
because the number that is wrong is the number the weight is built from. And if
the collapsed value was instead a failed fit, G = 1 merges the image mis-scaled by
an unknown factor. Per-crystal scales on serial stills genuinely span orders of
magnitude, unlike frames of one rotation sweep, so both readings are live.
An image whose scale is not believable has no usable scale. Write NaN into its
image_scale_corr, which every merge path already skips on, so it drops out of the
merged intensities, the error model and the statistics consistently.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
leonarski_fandClaude Opus 5
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