trend2d(1gmt) on Linux
The text 2f01af0a49de, as Debian 8 (Jessie), Debian 7 (Wheezy), Debian 6.0 (Squeeze), Debian 4.0 (Etch), Debian 3.1 (Sarge) 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 -
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-N -
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-W -
-bi -
-bo