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tokens: We thank the anonymous referee for the comments that have greatly helped improve the presentation of our results. We also thank Emanuele Dalessandro for sending us his HST photometry for M3, and Luca Sbordone and Fiorella Castelli for their expert advice in the use of the ATLAS9 and SYNTHE packages. Support for A.A.R.V., M.C., J.A.-G., R.C.R., and S.A. is provided by the Ministry for the Economy, Development, and Tourism’s Programa Iniciativa Científica Milenio through grant IC 120009, awarded to the Millennium Institute of Astrophysics (MAS); by Proyecto Basal PFB-06/2007; and by Proyecto FONDECYT Regular #1141141. A.A.R.V., J.A.-G., and R.C.R. acknowledge support through FONDECYT postdoctoral grants #3140575, 3130552, and 3130320, respectively. J.A.-G. acknowledge support by the FIC-R Fund, allocated to the project 30321072. This work was done (in part) using the Geryon computer at the Center for Astro-Engineering UC, part of the Basal PFB-06 project, which received additional funding from QUIMAL 130008 and Fondequip AIC-57 grants for upgrades. Additional support for this project is provided by CONICYT’s PCI program through grant DPI20140066.