Hi there, You don't need to create a window, since the window procedure is a direct graphics procedure and does not work together with the new graphics functions, which are object graphics. To create a contour you just need to invoke that contour function, for example, these two lines will work: index = [30,60,90,120,150,220,255] c = CONTOUR(dist(300), /FILL, ASPECT_RATIO=1, RGB_TABLE=39, RGB_INDICES=index, C_VALUE=index) Was this helpful? Please, let me know. Cheers, Fernando Exelis VIS

Hi there again, I think now I undertstand what you meant. I think that you would like to use the contour function without having to show the results on the screen in a window, is that correct?. If that's the case, please, use the keyword BUFFER: BUFFER (Init) Set this property to 1 to direct the graphics to an off-screen buffer instead of creating a window. For example: c = CONTOUR(dist(300), /FILL, ASPECT_RATIO=1, RGB_TABLE=39, RGB_INDICES=index, C_VALUE=index, BUFFER=1) Cheers, fernando santoro Exelis VIS