Modifications to Plotskew.gs

[Mary Jo Nath]

Joe,
I think the "if" test in lines 608-614 in your plotskew.gs script are where the
drawing of the pressure levels are either turned on or off. In the case where
"DrawPLev=1", meaning that pressure is the Y axis coordinate, then "set ylab on"
causes GrADS to plot the pressure levels along the Y axis. By default GrADS
uses a regular interval. In this case, it has been using 100mb. You can set the yaxis
labeling levels explicitly using "set ylevs" according to the online documentation at
http://grads.iges.org/grads/gadoc/gadocindex.html. (see below)
I think if you insert the following line after line 611:

set ylevs 20 50 100 200 300 400 500 600 700 800 900 1000

you will get the levels drawn that you want.

Good luck.
Mary Jo