Fraction of red (U − B ≥ 1.0) galaxies as a function of density for three mass limited galaxy samples (mass lower limit in the label). Red squares are computed using the fainter volume limited tracers (MB ≤ − 19.3 − z), blue diamonds using the bright ones (MB ≤ − 20.5 − z). The values on the x axis represent the median density values in each density bin. The red straight lines are linear fits of the squares, the dashed blue lines of the diamonds, the slopes and their errors being quoted in the text. The total number of galaxies considered in each redshift bin is quoted in the lower part of each panel.
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