Prediction and partiality read one number, the per-image sigma_M, so a sigma_M
that moves takes the integrated reflection population with it and there is no
way to ask which of the two uses carries a downstream difference.
--prediction-mosaicity fixes the width the prediction window opens to while the
partiality keeps using the measured sigma_M, which separates them.
Measured with it on a rotation crystal whose lattice search returns two
different cells a few tens of microns of detector distance apart: widening the
prediction window from the narrower branch's 0.203 deg to the wider branch's
0.272 deg adds 28% more partials and moves the merged statistics by less than
half a percent (I/sigma 6.1 -> 6.2, R_meas 12.7 -> 12.6%, ISa 10.7 -> 10.9);
narrowing the wide branch the other way removes 26% of its partials and
recovers nothing. On a tetragonal reference crystal a 4.7x over-wide window
costs 11%. The prediction window is not where a mosaicity difference turns into
a merged-data difference - the captured-fraction gate and the partiality
weighting downstream absorb a generous window.
Diagnostic only; off by default, so nothing changes unless it is asked for.
leonarski_f
a0604ff244