[ncl-talk] overlay polyline boundaries for all four subplots in one panel

[LSL]

Dear NCL community,


I have met a problem when overlaying polyline boundary on each contour 
plots within one panel. It seems that whatever how many  sentences with 
gsn_add_shapefile_polylines added, there is always one boundary on one 
plot.


How can I add for all four plots? Thanks in advance,


LSL


The script and figure is attached.

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