tokens: We warmly thank the anonymous referee for his/her helpful comments and suggestions. AS acknowledges the PRIN INAF 2011 ‘Multiple populations in globular clusters: their role in the Galaxy assembly’ (PI E. Carretta) and the PRIN INAF 2014 ‘Probing the internal dynamics of globular clusters. The first one is comprehensive radial mapping of individual star kinematics with the generation of multi-object spectrographs’ (PI: L. Origlia). ED and CP acknowledge support from the European Research Council (ERC-2010-AdG-267675, COSMIC-LAB). Based on FOcal Reducer and low dispersion Spectrograph (FORS) observations collected with the Very Large Telescope of the European Southern Observatory, Cerro Paranal, Chile, within the observing programmes 091.D-0562(A) and 093.D-0228(A) (PI: Dalessandro), and on observations made with the Large Binocular Camera at the Large Binocular Telescope within program INAF.D07-2010A (PI: Ferraro) and with the Advanced Camera for Surveys (ACS) on board to the NASA/ESA Hubble Space Telescope under programs GO-10775 (PI: Sarajedini).
ner_tags: O O O O O O O O O O O O B-Person O O B-Grant I-Grant I-Grant I-Grant I-Grant I-Grant I-Grant I-Grant I-Grant I-Grant I-Grant I-Grant I-Grant I-Grant O B-Person I-Person O O B-Grant I-Grant I-Grant I-Grant I-Grant I-Grant I-Grant I-Grant I-Grant I-Grant I-Grant I-Grant I-Grant I-Grant I-Grant I-Grant I-Grant I-Grant I-Grant I-Grant I-Grant I-Grant I-Grant I-Grant I-Grant I-Grant I-Grant O B-Person I-Person B-Person O B-Person O O O O B-Organization I-Organization I-Organization B-Grant I-Grant O O B-Instrument I-Instrument I-Instrument I-Instrument I-Instrument I-Instrument B-Instrument O O O O B-Telescope I-Telescope I-Telescope O O B-Observatory I-Observatory I-Observatory B-Location I-Location I-Location O O O O B-Proposal O B-Proposal O B-Grant O O O O O O B-Instrument I-Instrument I-Instrument O O B-Telescope I-Telescope I-Telescope O O B-Grant O B-Person O O O B-Instrument I-Instrument I-Instrument I-Instrument B-Instrument O O O O B-Telescope I-Telescope I-Telescope I-Telescope O O B-Grant O B-Person