tokens: Acknowledgments We thank Alireza Rahmati, Alexandre Refregier and Sergey Koposov for useful discussions, and Robert Crain for kindly providing the data from the EAGLE simulations. This work has made use of the VizieR catalogue access tool, CDS, Strasbourg, France. The original description of the VizieR service was published in the AAS 143, 23. HP's research is supported by the Tomalla Foundation. GK gratefully acknowledges support from the ERC Advanced Grant 320596 ‘The Emergence of Structure During the Epoch of Reionization’.
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