Sorry. As I said, I never tried it myself. The way FSUM is performed for a PSD it actually could support RSYS, but apparently that wasn't enabled. For a spectrum analysis the FSUM is performed on each mode separately and the modal fsum values are recombined. I found that FSUM moments aren't in the local coordinate system even if you rotate the node, so that's not a workaround. You could get the moments in a local coordinate system for an individual mode using RSYS and FSUM,RSYS and a mode factor equal to the square root of the variance.
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