draw reference line over contour plot

Hallo NCL people,

I cant find a trick how to plot a reference line in
*gsn_csm_contour*
in which my X-axis is month and y axis is height (km). I wanted to create
something like this function gsnxRefLine in month-5.

Thanks for any short hints.
Best,

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Received on Tue May 20 06:26:39 2014