Analysis of color-magnitude diagram dividing the galaxy sample (gray points of Fig. 10) according to the local environment. The color-code follows that of Fig. 13. Panel a contains galaxies in the densest environments of the field, including the cluster core and outskirts overdensities. Panel b contains galaxies in denser environments up to two times the mean density. Panel c contains galaxies in environments less dense than the mean density of the field. Panel d shows a normalized histogram of the ɡ − r color for the three galaxy samples. Horizontal dashed lines represent the location of the peaks of the distributions (see text for details). The percentage of red galaxies is 65.2, 32.8, and 21.1% for the three density environments respectively, showing a clear abundance of red galaxies in the densest regions of the field. The black contours in each plot contain 5, 25, 50, and 75% of the galaxies for each sample. The red line and the red area represent the sequence of red galaxies obtained with the spectroscopic cluster sample.