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Fig. 5

image

Left: best IGM damping wing fit to the spectrum of GRB 140515A. Right: redshift evolution of the hydrogen neutral fraction. The dotted line shows the Gnedin & Kaurov (2014) model and points to (see legend) the observational measurements of this quantity (data from Totani et al. 2006; Patel et al. 2010; and Chornock et al. 2013). Points with arrows are lower or upper limits.

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