psbasemap(1) on Linux
The text d90b7f0a97ce, as Debian 2.2 (Potato) shipped it.
To plot PostScript basemaps
Flags it lists
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-B -
-E -
-G -
-J -
-Jz -
-K -
-L -
-O -
-P -
-R -
-U -
-V -
-X -
-Y -
-Z -
-c