pssegyz(1gmt) on Linux
The text c2ac7c3fecd3, as Debian 8 (Jessie) shipped it.
Create imagemasked postscript from SEGY file
Flags it lists
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-A -
-B -
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-D -
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-F -
-I -
-J -
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-L -
-M -
-N -
-O -
-P -
-R -
-S -
-U -
-V -
-W -
-X -
-Y -
-Z