tokens: ACKNOWLEDGEMENTS We thank Alis Deason for providing the properties of her modelled stellar haloes in electronic form. We acknowledge useful discussions with Antonela Monachesi, Kohei Hattori, Sarah Loebman, Monica Valluri, Ian Roederer, and Adam Smercina. We also would like to thank the Illustris simulations team, in particular Annalisa Pillepich, Vincent Rodrigues-Gomez, and Dylan Nelson.
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