Contour labels
By default, contours are labeled with the actual contour level, using
three significant digits. See the discussion on the
\LEGEND qualifier for an alternate contour labeling facility.
Contour label size
The size of the contour labels is
CONTOURLABELHEIGHT.
If labels are not desired on the contours, set the
CONTOURLABELHEIGHT characteristic to 0 to set the label height to
zero before entering the CONTOUR command. The default is
%CONTOURLABELHEIGHT = 2.
Contour label separation
The separation between contour labels is controlled with
CONTOURLABELSEPARATION.
The default is CONTOURLABELSEPARATION = 10.