Making pressure-height plot with equally spaced pressure level

Hi, Sir/Madam,

I would like to make plots of zonal mean of some variable, that is, a
plot with altitude as Y-axis versus latitude as X-axis.
However, all examples I found on NCL website using equally spaced
height as Y-axis.
How can I use equally spaced pressure or sigma level as Y-axis?

I also checked examples for general contour plots. They may serve
well. However, the example is too simple for me to follow. I have no
idea about how should I setup coordinates for the variable to plot so
that NCL can understand Y-axis is altitude and X-axis is latitude or
whatever coordinate. Is there a detailed example?

Thank you very much.
Yaosheng Chen
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Received on Mon Jan 4 10:34:44 2010