begin a = addfile("pop.nc","r") ; Read in POP data. t = a->t t@lat2d = a->lat2d t@lon2d = a->lon2d wks = gsn_open_wks("png", "contour4c") ; Open png file called "contour4c.png" res = True res@gsnAddCyclic = True ; Add cyclic point. res@cnFillOn = True ; Turn on contour fill. res@cnFillPalette = "BlAqGrYeOrRe" ; Choose color map plot = gsn_csm_contour_map(wks,t,res) ; Call the gsn_csm function for ; drawing contours over a map. end