GSAS Refinement Hints

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GSAS Profile 4 anisotropy Sxxx terms

Re: the "best" order for incorporating profile 4 anisotropy Sxxx terms into a refinement?

Robert Von Dreele writes: (July 28, 2011)

"Usually, I do the S4xx ones first & then the others. The thing is fairly stable after that.
Do do all of them at once in any case  in the end. The S4xx must be > 0 but the rest can be any sign.
If you want a quick way of seeing the shape, run mustrplot (spelling?) in GSAS; 
you'll need gnuplot to see the plot. For monoclinics, it might look like two beans back-to-back."
-Bob