Kevin, Your problem is your FINT line: FINT = 200//-200 FLINE = 15;14;0;0;0;0;0;0;0 When the range of plotting values does not go lower than -200, then the first color (15) will be plotted in the -200 bin, and the next color (14) will be used in the bin of values >-200. What you want is: FINT = -400;-200;0 Then the colors 15 and 14 are fixed to the bins <-400 and <-200. Steve Chiswell Unidata User Support