backtracker(1gmt) on Linux
The text c77ea6af57cc, as Debian 4.0 (Etch) shipped it.
Forward and Backward flowlines and hotspot tracks
Flags it lists
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-: -
-A -
-C -
-D -
-E -
-H -
-L -
-M -
-N -
-Q -
-S -
-T -
-V -
-W -
-bi -
-bo