tokens: This research was supported by the Victorian Life Sciences Computation Initiative (VLSCI), grant ref. UOM0005, on its Peak Computing Facility hosted at the University of Melbourne, an initiative of the Victorian Government, Australia. Part of this work was performed on the gSTAR national facility at Swinburne University of Technology. gSTAR is funded by Swinburne and the Australian Governments Education Investment Fund. This research programme is funded by the Australian Research Council through the ARC Laureate Fellowship FL110100072 awarded to JSBW. CP acknowledges support of ARC DP130100117 and DP140100198, and ARC Future Fellowship FT130100041. AM acknowledges support from the European Research Council (ERC) under the European Unions Horizon 2020 research and innovation programme (grant agreement no. 638809 AIDA). We thank Volker Springel for making his gadget-2 and subfind codes available to us and Peter Behroozi for making his rockstar code available. We also thank N. Gnedin for several very useful comments on our manuscript.
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