This command specifies the projection longitude for your
map projection.

Widget:
- There is no widget interface for this command.
Command:
Arguments:
- longitude: the desired projection longitude between -180 and
180 degrees.
Examples:
- PLON=90
Designates 90 degrees east as the projection longitude.
Notes:
- To set the projection latitude, refer to PLON.
- To set the map rotation, refer to ROTA.
- For more information on map projections, refer to the manual
for NCAR Graphics subroutine "Easy Map".
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