[GSAS-II] Calibration with incomplete rings

[Todd Hufnagel]

Hi Brian,

I have some diffraction patterns from alumina that I would like to use for calibration purposes, but the patterns themselves have only partial rings (roughly 1/4 of the ellipse). Attempting to calibrate using these yields an error "1st ring not sufficiently complete to proceed” and, looking at the code, it seems that GSAS II wants the calibration rings to be complete ellipses.

Can this be relaxed, or can you suggest a way to work around it? 

Thanks,

Todd

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Todd Hufnagel
Professor
Department of Materials Science and Engineering
Johns Hopkins University