Colin Telmer wrote: > The prblem with grace is that it does not do 3d plots AFAIK. Does gri? It doesn't. I hate 3D plots for most uses. There's always some peek that hides info behind them, and they are hard to read. Gri does contour plot and can convert grids to images. I often create a grayscale or colour image of the grid, and then overlay a few contour lines on top. Peter