tokens: ACKNOWLEDGEMENTS We would like to thank Harley Katz, Yohan Dubois, and Marta Volonteri for useful discussion, and the anonymous referee for constructive comments. The research of RSB is supported by Science and Technologies Facilities Council (STFC) and by the Centre National de la Recherche Scientifique (CNRS) on grant ANR-16-CE31-0011, and the research of AS and JD at Oxford is supported by Adrian Beecroft. This work is part of the Horizon-UK project, which used the DiRAC Complexity system, operated by the University of Leicester IT Services, which forms part of the STFC DiRAC High Perforamce Computing Facility ( http://www.dirac.ac.uk ). This equipment is funded by National E-Infrastructure capital grant ST/K000373/1 and STFC DiRAC Operations grant ST/K0003259/1. DiRAC is part of the National E-Infrastructure. All visualizations in this work were produced using the yt-project (Turk et al. 2011 ).
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