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The stellar IMF in early-type galaxies from a non-degenerate set of optical line indices

We investigate the optical spectral region of spectra of 1000 stars searching for IMFsensitive features to constrain the low-mass end of the initial mass function (IMF) slope in elliptical galaxies. The use of indicators bluer than NIR features (NaI, CaT, Wing-Ford FeH) is crucial if we want to compare our observations to optical simple stellar population (SSP) models. We use the MILES stellar library (S anchez-Bl azquez