How to draw two plots in one figure, likes "hold on" in MATLAB

Hey

I need to use gsn_csm_xy to draw two plots. Each of them are based on
the data from different source file. How to plot them in one figure?

I know in matlab, I can draw one. Then hold on, and then plot another
one on the top.

How to implement this in ncl?

Thanks

Xiaoming
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Received on Wed Jan 31 2007 - 13:12:22 MST