overlay

I am using the overlay function to overlay 2 plots onto a base plot:

plot = gsn_csm_vector_scalar_map( ...)
plota = gsn_csm_vector_scalar_map( ...)
plotb= gsn_csm_vector_scalar_map( ...)

overlay(plot,plota)
overlay(plot,plotb)
draw(plot)
frame(wks)

This doesnt work and the error below appears twice.

fatal:NhlAddOverlay: plot class mapPlotClass cannot be overlay plot member

What am I missing?

-- 
James Correia Jr.
Post Doc
Climate Physics Group, PNNL

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Received on Mon Jul 14 2008 - 08:20:45 MDT