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tokens: We thank the Planck collaboration for making available the calibration sample in the SZ cluster data base ( http://szcluster-db.ias.u-psud.fr ). We thank the referee for helpful comments. HI would like to thank D. Applegate for a helpful discussion. HI acknowledges support from European Research Council grant MIRG-CT-208994 and Philip Leverhulme Prize PLP-2011-003. JN acknowledges a PUT 246 grant from Estonian Research Council. RJM is supported by a Royal Society University Research Fellowship. THR acknowledges support from the German Research Association (DFG) through Heisenberg grant RE 1462/5 and through the Transregional Collaborative Research Centre TRR33 ‘The Dark Universe’ (project B18). GS and THR acknowledge DFG grant RE 1462/6. This research has made use of the SZ-Cluster Database operated by the Integrated Data and Operation Center (IDOC) at the Institut d'Astrophysique Spatiale (IAS) under contract with CNES and CNRS.