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tokens: This paper has benefitted from discussions in depth with the referee J. Th. van Loon. This work was partially funded by the Spanish MICINN under the Consolider-Ingenio 2010 Program grant CSD2006-00070 First Science with the GTC 6 , and through grants AyA2011-24052. This work has been supported by the CoSADIE Coordination Action (FP7, Call INFRA-2012-3.3 Research Infrastructures, project 312559). F.J.E. acknowledges financial support from the ARCHES project (7th Framework of the European Union, No. 313146). Support was also granted by Deutsche Forschungsgemeinschaft through grant EN 176/30.