trend2d(1) on Linux
The text 128f3672eae0, as Debian 2.2 (Potato) shipped it.
Fit a [weighted] [robust] polynomial model for z = f(x,y) to xyz[w] data.
Flags it lists
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-: -
-C -
-F -
-H -
-I -
-N -
-V -
-W -
-bi -
-bo