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tokens: This work has been partially supported by the Italian Ministry of the University under grant RBFR082838 and “LNS-Astrofisica Nucleare (fondi premiali)” by PRIN-MIUR 2010-2011 ( Chemical and dynamical evolution of the Milky Way and Local Group galaxies , PI F. Matteucci), by PRIN-INAF 2012 ( The M4 Core Project with Hubble Space Telescope , PI L. Bedin), and by INFN ( Iniziativa specifica TAsP ).