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tokens: We would like to thank the anonymous referee for useful comments that improved the paper. This work was supported by the European Research Council (ERC-2015-AdG grant No. 695008), FCT (Portugal) grant SFRH/IF/01780/2013, DOE grants DE-SC0008409 and DE-SC0008655, and NASA grant NNX16AB28G. D.A.U. gratefully acknowledges the hospitality of the Institute for Advanced Study and the support from the Ambrose Monell Foundation. Simulations were carried at MareNostrum (Spain) under a PRACE award. Software: OSIRIS (Fonseca et al. 2002 ).