Subchapters:

Plots

Surface

with a 2D array, you can make an image or a contour or a surface:

IDL> surface,im2

IDL> shade_surf,im2

IDL> show3,im2

Change the color table with xloadct:

There are interactive tools for plotting surfaces:

IDL> surf_track, im2
IDL> xsurface, im2