Hi, I did a script to do a vector rotation: use data_ocean let/d=data_ocean theta=(-49)*3.14159265/180 let/d=data_ocean uwat_49=cos(theta)*uwat[d=data_ocean]-sin(theta)*vwat[d=data_ocean] let/d=data_ocean vwat_49=sin(theta)*uwat[d=data_ocean]+cos(theta)*vwat[d=data_ocean] When I load this script with the gui interface, I can choose uwat_49 and vwat_49 but not (uwat_49,vwat_49) Does somebody has an idea? Vincent