KEPLER_VDISK is a variable that indicates the disk systemic veloc-
ity (in km/s). The value is always used to define the velocity field
(see KEPLER_VELO result variable).
However, for the radial profile, the usage depends on the /VSYSTEM op-
tion. When /VSYSTEM is not present, the radial profile is taken as the
maximum brightness of the integrated, velocity aligned, spectrum for at
each radius. When /VSYSTEM option is present, the radial profile is tak-
en at the velocity KEPLER_VDISK.
Gildas manager
2023-06-01