Problem with data-plotting

Hi,
I encountered a problem while trying to do a simple contour plot of a 2D
data (Netcdf file, 48x96 grid). The plot shows contours over only a few
grid-cells, even though there are more valid values in the data. I
couldn't find any problems with the netcdf file and the data (though
there are many missing values; the data contains the fill_value
attribute as well, _FillValue = -9999.). The code is as below:
> load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_code.ncl"
> load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_csm.ncl"
>
> begin
> a=addfile("test_data.nc","r")
> x = a->HDO
> N = num(.not.ismissing(x))
> print(N)
>
> wks = gsn_open_wks("x11","test")
> gsn_define_colormap(wks,"rainbow")
>
> res = True
> res@cnFillOn = True
> res@gsnSpreadColors = True
>
> plot = gsn_csm_contour_map(wks,x,res)
>
> end

Thanks a lot in advance,

Thejna Tharammal.

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