Up: GREG2 Language Internal Help
[GREG2\]LEVELS C1 C2 TO C3 BY C4 ...
sets the contour levels to be C1, C2, C2+C4, C2+2*C4, ..C3, and so on,
using the same list format as SIC\ command FOR. The contour levels are
used to make contour plots of the Regular Grid array using command
RGMAP. Up to 30 contours can be given at a time. Note that it is more
efficient to use a single RGMAP command with many levels than many RGMAP
commands with a single level each.
LEVELS without arguments will display the contour levels, and LEV-
ELS NONE reset the level list.