Dear Rietveld Community, I'm concerned about the question of "mixed" description of a model having typical(?) combination of light and heavy scattering atoms, in which, ADPs are invoked for the latter, while former are still with IDPs. The past (seems, more often) and present practice in single crystal diffraction allows that treatment for poor scattering: for, instance, ISOR command in SHELX is designed to emulate IDP-like behavior of APDs for meaningful description of disordered/solvent molecules. Does it make any sense to include the second moments for pdf's of the sort keeping other ones nearly Gaussian?
With Kind Regards, Artem
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