model levels in grib files

[Dan Leins]

All,

I have a series of scripts I use to plot fields at numerous model levels, (
i.e. heights at 925mb, 850mb, 700mb, etc...)  from a grib file.  I dump the
grib files out to a control file using grib2ctl and go from there. To do
this, I simply "d hgtprs(z=7)" or "d hgtprs(z=11)" or whatever z level I'm
interested in.  However, is there a way to plot a specific level without
referring to Z?  In short, I wrote my scripts to use on one specific set of
grib files, but occasionally I will need to use my scripts on a different
set of grib files which do not contain the same levels. So usually Z=7 would
be equivalent to 850mb, but in my other set of grib files z=7 is actually
equivalent to 250mb which is a big problem.  Any workarounds or other ways
to refer to the model levels or will I need a completely different set of
scripts for my other grib files?

Thanks,
Dan
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