[ncl-talk] add polyline with gsn_csm_pres_hgt_vector

[Zhifeng Yang]

Hi

I want to add a polyline on a image plotted by gsn_csm_pres_hgt_vector, and
the y value of the polyline is height, which is the right y-axis. I can add
a polyline using the left y-axis, but I need to reverse pressure to plot a
polyline. I don't know how plot a polyline with reversed y-axis. Most
important, I am not sure how to add a polyline using the right y-axis. Do
you know how to fix it?

Thank you
Zhifeng
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