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tokens: ACKNOWLEDGEMENTS We thank Frank van den Bosch and the anonymous referee for constructive comments on the paper. The simulations analysed in this paper were run on the Harvard Odyssey and CfA/ITC clusters, the Ranger and Stampede supercomputers at the Texas Advanced Computing Center as part of XSEDE, the Kraken supercomputer at Oak Ridge National Laboratory as part of XSEDE, the CURIE supercomputer at CEA/France as part of PRACE project RA0844, and the SuperMUC computer at the Leibniz Computing Centre, Germany, as part of project pr85je. KTEC acknowledges support from the Singapore National Science Scholarship.