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Fig. 11.

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Inferred local HI column density as a function of redshift. Grey points show the median and 68% range inferred from fits to individual spectra. Red markers show the median and 68% range in four redshift bins. The grey shaded region shows the range of NH I estimated in median stacked spectra of ∼1000 z ∼ 3 LBGs by Reddy et al. (2016).

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