niversity of Ly
pectroscopic analysis S
oftware) is an open-source software package written in the GDL
analyse astronomical data.
ULySS fits a spectrum with a linear combination
of non-linear components convolved with a line-of-sight velocity
distribution (LOSVD) and multiplied by a polynomial continuum.
ULySS is used to study stellar populations of galaxies and star clusters
and atmospheric parameters of stars.