[GSAS-II] Refinement of U, V, W While Refining Individual Peak Sigma and Gamma

[Brenig Andreas]

Dear GSAS-II Users,

I am encountering an issue while determining the instrument
parameters U, V, W, X, and Y for an instrument parameter file.

According to the tutorial "Create Instrument Parameter File:
Determine Starting Profile from a Standard", it should be
possible to refine U, V, W, X, and Y while simultaneously
refining the sigma and gamma parameters of individual
peaks whose widths are inconsistent with the rest.

However, when I enable refinement of sigma and gamma
for certain peaks, the refinement flags for U, V, and W are
automatically cleared, and only X and Y remain active.
If I disable only the sigma refinement flag, then all instrument
parameters can be refined.

How can I refine the instrument parameters while still allowing
refinement of sigma and gamma for selected peaks? Is there
something I may be misunderstanding or doing incorrectly?

Thank you very much for your help.

Best,
Andreas


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