tokens: We acknowledge useful conversations with Dan Coe on this topic, who has been attempting similar measurements on his triply imaged z ∼ 11 candidate. SMW acknowledges support from the Science and Technology Facilities Council. IL acknowledges support from the European Research Council grant HIGHZ no. 227749 and the Netherlands Organization for Scientific Research Spinoza grant. The Dark Cosmology Centre is funded by the Danish National Research Foundation.
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