tokens: MS thanks Keiichi Umetsu for useful discussions and Adi Zitrin and Julian Merten for providing useful information on the SL analysis of the CLASH clusters. LM and MS acknowledge financial contributions from contracts ASI/INAF I/023/12/0, by the PRIN MIUR 2010-2011 ‘The dark Universe and the cosmic evolution of baryons: from current surveys to Euclid’ and by the PRIN INAF 2012 ‘The Universe in the box: multiscale simulations of cosmic structure’. CG's research is part of the project GLENCO, funded under the European Seventh Framework Programme, Ideas, Grant Agreement no. 259349.
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