put map on top

Hello

In the attached figure, I would like to put the map on the top of the trajectories. How could I do that ?

For the current figure, I used
plot = gsn_csm_map(wks,res) to draw the map
and used
       gsn_polyline (wks, plot, 360-lat_long(:,1) , lat_long(:,0), resp)
to draw the trajectories.

I tried to overlay another map on the top of everything by adding
plot2 = gsn_csm_map(wks,res)
overlay(plot,plot2)
which apparently didn't work out since "A map plot can't be overlaid on another map plot."

Is there any way I could put a map at the top?

Thanks

Xiaoming

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