Fig. 9.

Free path vs. absolute magnitude M1450 for individual SDSS QSOs at 3.8 < z < 4.0 and I ≤ 20.0 (small black dots). The large blue points show the average value of the free paths in bins of ΔM1450 = 1.0. The error bars of the large blue points show the 84th and 16th percentiles of the IFP distributions for each bin of absolute magnitude.
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