sphinterpolate(1gmt) on Linux
The text 2de0e5a74e9b, as Debian 8 (Jessie) shipped it.
Gridding in tension of spherical data
Flags it lists
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-: -
-F -
-G -
-H -
-I -
-Q -
-R -
-T -
-V -
-Z -
-bi -
-bo -
-m