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tokens: We acknowledge the insightful discussions and useful comments of A. de Ugarte-Postigo and C. Thöne. We acknowledge the support from the European Research Council (Starting Independent Researcher Grant CAMAP-259276), and the partial support of grants AYA2010-21097-C03-01, CSD2007-00050 and PROMETEO-2009-103. CC-M also acknowledges the support of ACIF/2013/278 fellowship, and the partial support of UV-INV-PREDOC13-110509 fellowship. We thankfully acknowledge the computer resources (‘Lluís Vives’ and ‘Tirant’ supercomputers), technical expertise and assistance provided by the Servei de Informatica at the University of Valencia.