;   WAVERANGE: Wavelength range that the ULYSS fitting procedure will use.
;              ULY_SPECT_ALLOC) or array of file names or spectrum structures.
;              can find and use their own template star(s).
;   WL:        Limits for the weight of each model component [min_w, max_w].
;              The weight is in data units over component units.
;              This constraint is ignored when ULySS fits a single component.
;     or any sort of spectrum. It is typically used to fit the LOSVD.
;     the kinematics of galaxies.
;     best represent the fitted spectrum.