Fig. 1.
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Effective opacity (averaged over an ensemble of lines of sight) due to neutral hydrogen gas in the IGM as a function of redshift, for different wavelengths corresponding to the six Swift-UVOT filters. Solid lines show the results obtained from the analytical model of Inoue et al. (2014b). Dashed lines indicate the results adopted from Fig. 3 of Ghisellini et al. (2010), overplotted for comparison.
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