Free electron fraction, xe(z), constrained from Planck using the “FlexKnots” method of Planck Collaboration IV (2020) and Millea & Bouchet (2018), along with astrophysical constraints, as tabulated in Bouwens et al. (2015), updated to include Greig et al. (2017), Bañados & Venemans (2018), Mason et al. (2018), and Davies et al. (2018).
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