Fig. 2.
Normalized redshift distributions for tracer quasars (black) and Lyα forest absorption pixels of Lyα region (blue) and Lyβ region (red). The histograms include 266 590 tracer quasars, 30.2 × 106 pixels in the Lyα region, and 4.0 × 106 pixels in the Lyβ region. The vertical dashed lines show the mean value of each distribution: 
(tracer quasars), 2.37 (in Lyα), 2.26 (in Lyβ).
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