Using spectroscopic data to disentangle stellar population properties N. Cardiel, J. Gorgas, P. Sánchez-Blázquez, A. J. Cenarro, S. Pedraz, G. Bruzual and J. Klement A&A, 409 2 (2003) 511-522 Published online: 17 November 2003 DOI: 10.1051/0004-6361:20031096