access user defined at - already NULL in the object if not user defined
access user defined at - already NULL in the object if not user defined

jread-usgs/gsplot,jread-usgs/gsplot,dpattermann-usgs/gsplot,lindsaycarr/gsplot,ldecicco-USGS/gsplot,USGS-R/gsplot,dpattermann-usgs/gsplot,ldecicco-USGS/gsplot,lindsaycarr/gsplot