spectrum1d(1gmt) on Linux
The text 0b9bd4ca5c6e, as Debian 5.0 (Lenny) shipped it.
compute auto- [and cross- ] spectra from one [or two] timeseries.
Flags it lists
-
-C -
-D -
-N -
-V -
-W -
-bi -
-bo -
-f