Hello, I have a question about UVMOD. Suppose you are inserting a source in a dataset with an offset from the tangent point (set by FPOS). Would that be equivalent to shifting the dataset using UVFIX (with SHIFT<>0), inserting a source using UVMOD (with FPOS=0) and then do the inverse shift using UVFIX? If yes, would SHIFT=FPOS? Thanks, Hanno.