[ncl-talk] overlaying multiple datasets on a map

[M P]

Hello,
I am using command below to overlay plots with
data from aqual and terral
map = gsn_csm_contour_map_overlay(wks,aqual,terral,res,res)

I'd like to overlay other datasets on the map but
gsn_csm_contour_map_overlay won't take more arguments.
All data have the same lats and lons (=aqual and =terral)

How can I do it?
Thanks,
Mark
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