free grads

draw line

draw line x1 y1 x2 y2

Draws a line from x1, y1 to x2, y2 using current line drawing attributes. See the set line command.

set lfcols

Color where a<b in white (1) and b>a in red (2).

set lat|lon|lev|time|ens

set lat|lon|lev|time|ens val1 <val2>

This set command sets one dimension of the dimension environment using world coordinates.