help for overly xy-plot and contour-plot using NCL

Hi ncl-talkers,

I was trying to plot a time-height distribution of vertical velocity and
overlay the precipitation on it in the same figure. I tried "overlay" and
"polylines", but all failed.

Data are omega(time,z) and rain(time). They both have the same time
dimension.

In the figure, the x-axis is time dimension, the left y-axis is height, and
the right y-axis is precipitation amount.

Any clues to make it happen?

Thank you so much,
Sha

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Received on Wed May 1 13:16:14 2013