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tokens: ACKNOWLEDGEMENTS We are very grateful to the constructive and detailed review carried out by our anonymous referee. His/her numerous and wise comments have helped to significantly improve this paper. We thank Manuel Peimbert, Jairo Méndez-Abreu, Leticia Carigi, and Rolf Kudritzki for their useful comments. This paper is based on observations made with the Gran Telescopio Canarias (GTC), installed in the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrofísica de Canarias, in the island of La Palma, Spain. This research has made use of Aladin Sky Atlas developed at CDS, Strasbourg, France. This work has been funded by the Spanish Ministerio de Economía y Competividad (MINECO) under project AYA2015-65205-P. JGR acknowledges support from an Advanced Fellowship from the Severo Ochoa excellence program (SEV-2015-0548).