Comparison between dwarf galaxies in different cluster substructures. Dwarfs not included in the three main subgroups are labeled as “Outside”. Top panels: the color-magnitude diagram is shown on the left, while the g − r color distributions are shown as histograms on the right panel. Symbol definitions are given in the legends. Bottom panels: on the left is reported the R_e vs. M_r plane, while on the right are the R_e distributions for dwarfs in the four substructures.