Analysis of galaxy properties on outskirts overdensities. Left: selection of the three overdense regions in the cluster outskirts r > 2r₂₀₀. The background shows the density field computed with the red galaxy sample (bottom panel of Fig. 11). The crosses over the plot correspond to galaxies in overdense environments with δ > 1. Regions A, B, and C are determined using the red-sequence density field. White circles are the same as those in Fig 11. Middle: detailed analysis of the color-magnitude diagram shown on panel a of Fig. 14. The red stripe represents the red sequence found with spectroscopic cluster members. Blue points are galaxies with δ > 1 .5, which corresponds to the cluster core. Green points are galaxies related to the three sub-structures (Regions A, B, and C) in the cluster outskirts at r > 2r₂₀₀. Right: histogram of the ɡ − r color for both galaxy samples shown in the central panel.