Fig. 3
Number of H i absorbers with log NH i = [12.75,17] as function of redshift in our our sample of 18 high-redshift quasars. The solid line is for the Lyα-only fit. The dashed line is for the high-order fit, while the red heavy dot-dashed line is for the Lyα-only fit for the redshift range used for the high-order fit.
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