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tokens: We are grateful to M. Beasley, J. Beckman, F. La Barbera and R. Peletier for very useful discussions and valuable suggestions. We thank G. Bruzual for providing us with various versions of his models in the UV spectral range and for interesting suggestions. We also thank E. Toloba for providing us with fully reduced early-type galaxy spectra. We are grateful to the anonymous referee for valuable suggestions that helped us to improve the paper. This research has made an extensive use of the SIMBAD data base and VizieR catalogue access tool (both operated at CDS, Strasbourg, France), the NASA's Astrophysics Data System Article Service. This work has been supported by the grants AYA2013-48226-C3-1-P and AYA2013-48226-C3-2-P from the Spanish Ministry of Economy and Competitiveness ( MINECO ) and the Generalitat Valenciana under grant PROMETEOII/2014/069 . ER acknowledges a Marie Heim-Vögtlin grant from the Swiss National Science Foundation .