Top-left panel. Colour-density relation for galaxies with MB ≤ −18.5 − z and 0.1 < z < 0.5. We use CWD computed with flux limited tracers. Red diamonds are for the 5th n.n. density estimator ([5th]), while the blue triangles for the density computed with a 5 Mpc Gaussian filter ([5g]). x axis values are the median value in four roughly equipopulated bins of the density distribution, vertical error bars are given by the usual binomial formula. “Ntot” is the number of galaxies in the subsample, while the linear fit slope value is quoted with its error for both the densities. Top-right panel. Scatter plot of [5th] (x axis) and [5g] (y axis) densities. The straight line is the bisector. Bottom-left panel. For any small bin of [5th] density (x axis, equipopulated bins of 300 galaxies), we plot the fraction of red galaxies in the first and last quartile of the [5g] density distribution (thick symbols are for the highest density bin, light symbols for the lowest density bin). Bottom-right panel. The opposite of the bottom-left panel. For any small bin of [5g] density (x axis), we plot the fraction of red galaxies in the first and last quartile of the [5th] density distribution (same symbols as in the bottom-left panel).
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