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Fig. 1.


Top panel: cosmic star formation histories with observational constraints from Bouwens et al. (2015). Middle panel: volume weighted ionization fraction (solid lines) and neutral fraction (dashed lines) with observational constraints from Fan et al. (2006) as a function of redshift for different reduced speeds of light. Bottom panel: xHII = 0.01% reionization redshifts measured for different reduced speeds of light.

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