[gradsusr] Isobars: draw "H" and "L"

[Jonas Kaufmann]

Hello,

I am trying to generate isobar maps from GFS output. So far everything
is looking fine, but I have one questions: I have not found a way to
automatically add "H" and "L" marks in the center of a high- or low
pressure system.

Is there a way to do this?

Thank you in advance!

Best regards,
Jonas Kaufmann