trend1d(1) on Linux
The text 50be12ab57c2, as Debian 2.2 (Potato) shipped it.
Fit a [weighted] [robust] polynomial [or Fourier] model for y = f(x) to xy[w] data.
Flags it lists
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-: -
-C -
-H -
-I -
-V -
-W -
-bi -
-bo