[gradsusr] Marking symbols of low and high pressure on the maps

[Krzysiek]

Dear Grads Users,

I would like to create sea-level pressure maps in GrADS on the basis of 
NetCDF file. Is it possible to create a script (or script's command) in 
order to mark a symbols of low and high pressure ('L' and 'H') inside 
the lowest/highest isobar automatically?

Regards,

Chris
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