efault is 0.

<H3>Options</H3>

The PGDISP window uses a default of 16 colors (2 if on a monochrome
screen or it can't get 16 colors for some reason), but this can be
changed with the lineColors resource. You need more than 16 colors for
PGPLOT gray-scales; I recommend 64. More than 64 colors is likely to
steal too many from other windows.<P>

The window can be resized arbitrarily.  The initial size is determined
by the figdisp.lg.geometry resource.  Since PGPLOT  automatically scales
to use the entire wind