fors_normalise_flat(7) on Linux
The text 2f154b8e2614, as Debian 10 (Buster) shipped it.
Normalise master flat spectrum
Flags it lists
-
--disp_nknots -
--dispersion -
--dradius -
--endwavelength -
--spa_polydegree -
--splfit_threshold -
--sradius -
--startwavelength