Abundance patterns in early-type galaxies: is there a “knee” in the [Fe/H] vs. [α/Fe] relation? C. J. Walcher, P. R. T. Coelho, A. Gallazzi, G. Bruzual, S. Charlot and C. Chiappini A&A, 582 (2015) A46 Published online: 05 October 2015 DOI: 10.1051/0004-6361/201525924