blockmedian(1gmt) on Linux
The text 0e2a493d08a7, as Debian 7 (Wheezy) shipped it.
filter to block average (x,y,z) data by L1 norm.
Flags it lists
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-: -
-C -
-E -
-F -
-H -
-I -
-Q -
-R -
-T -
-V -
-W -
-bi -
-bo -
-f