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tokens: We thank the anonymous referee for useful comments that helped us to improve the content of the paper. Based on observations made with the GTC, installed in the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrofísica de Canarias, in the island of La Palma. We acknowledge support from Mexican CONACYT grants CB-2010-01-155142-G3 (PI: YDM), CB-2011-01-167281-F3 (PI: DRG) and CB-2014-240562 (PI: MR). K.Z.A.-C. acknowledges support from CONACYT grant 351585.