Overlay

Hi all.

I need to overlay to one contour map plot (created using
gsn_csm_contour_map) another contour map plot (using the same gsn resource).
I produce the two plots and then i combine them with the command
"overlay", but i recieve this error:
"*fatal:NhlAddOverlay: plot class mapPlotClass cannot be overlay plot
member"*
In the examples you use for the main plot the
gsn_csm_contour_map_overlay resource, but i can not use it.

How can i do it ?

Thanks, Marco

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MARCO PASTORE
Istituto Nazionale di Geofisica e Vulcanologia
Gruppo Nazionale di Oceanografia Operativa
Viale Aldo Moro 44
40128, Bologna
Tel:(+39)051-3782649
Cel:(+39)339 8273965
Skype: mapas71
    
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