Hi Ufuk, Here is a demo that may help region/i=1:50/j=1:40 ; let v=if(i+j ge 40)then 1 else 0 ! to label the contour with a "1" ppl conset,,0 ; contour/lev=(0.999) v ! or to have no contour label contour/lev=(0.999)/size=0.001 v Hope this helps, Mick |____spillane@pmel.noaa.gov____| |__Room 2070 Bldg#3 NOAA/PMEL__| |____Phone_:_(206)526-6780_____|