Fig. 16.
Distribution functions of the u − g color for QSOs with high (green histogram, IFP ≥ 150 pMpc) and low (orange hatched histogram, IFP < 150 pMpc) IFPs. The solid and dot-dashed black lines refer to the average values of the orange and green distributions, respectively. Top (bottom) panel: u − g distributions for QSOs at higher (lower) redshift with respect to the median one at z ∼ 3.90.
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