Fig. 14
Neutral hydrogen column in the four systems (coloured shapes) compared to cumulative distributions of NH i from three samples of Ly-α absorbing systems: GRB host galaxies (Cucchiara et al. 2015; C15, to which we have added GRBs 120119A and 141028A from Wiseman et al. 2017), and QSO absorbers (Lehner et al. 2013; L13, Prochaska et al. 2015; P15).
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