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tokens: ACKNOWLEDGEMENTS We thank an anonymous referee for thoughtful comments. We thank our colleagues (J. Schaye, M. Schaller, R. Crain, and R. Bower) for sharing with us the data from the eagle simulation. This study was funded by the Science and Technology Facilities Council (grant number ST/F001166/1) and by the Interuniversity Attraction Poles Programme of the Belgian Science Policy Office (AP P7/08 CHARM). For this study, the DiRAC Data Centric system at Durham University was used. This system is run by the Institute for Computational Cosmology on behalf of the STFC DiRAC HPC Facility ( www.dirac.ac.uk ); the equipment was funded by BIS National E-Infrastructure capital grant ST/K00042X/1, STFC capital grant ST/H008519/1, and STFC DiRAC; as a part of the National E-Infrastructure. M.S. is supported by an STFC post-doctoral fellowship.