latitude versus pressure cross-sections

Hi:
I am trying to plot a pretty generic latitude versus pressure
cross-sections using the gsn_csm_pres_hgt. A printVarSummary of the
variable fZonAvg that I am trying to plot gives me the following:

Variable: fZonAvg
Type: double
Total Size: 28960 bytes
             3620 values
Number of Dimensions: 2
Dimensions and sizes: [lev | 20] x [lat | 181]
Coordinates:
             lev: [1000..20]
             lat: [ -90.. 90]
Number Of Attributes: 4
   missing_value : 9.969209968386869e+36
   remap : remapped via ESMF_regrid_with_weights: Bilinear remapping
   _FillValue : 9.969209968386869e+36
   average_op_ncl : dim_avg over dimension(s): lon

and the error messages that I get are below:

warning:ScalarFieldSetValues: coordinate array sfXArray requires 183
elements: defaulting
warning:ScalarFieldSetValues: coordinate array sfYArray requires 20
elements: defaulting
(0) get_lat_values: Warning: Your latitude values do not fall between
-90 and 90 inclusive.
(0) You will not get 'nice' latitude labels.
(0) get_lat_values: Warning: Your latitude values do not fall between
-90 and 90 inclusive.
(0) You will not get 'nice' latitude labels.
warning:LlSetValues: invalid range for Y Axis log mode; setting trYLog off

I do not understand why SfXArray requires 183 elements when fZonAvg uses
181, for instance. Also, I do not understand the get_lat_values either.
The corresponding sourcecode can be found in
/glade/scratch/laura/MPAS.projects/MPAS.gfs/run.physics_gfs.x1_655362.

Thanks,
Laura

-- 
!----------------------------------------------------
Laura D. Fowler
Mesoscale and Microscale Meteorology Division (MMM)
National Center for Atmospheric Research
P.O. Box 3000, Boulder CO 80307-3000
e-mail: laura@ucar.edu
phone : 303-497-1628
!----------------------------------------------------
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