Spectrum question

I am still looking for an answer to the question I submitted last week
about plotting a contour of the magnitude of a spectrum as a function
of frequency and altitude at constant latitude (and also as a function
of frequency and latitude at constant altitude). I show an example of
the type of plot I wish to produce below. I have used routine
"specx_anal", but this only produces a line graph. Can I do this in
NCL or not, and if so how ?.

Thanks,
Helen.

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