Distance distribution between cluster A2142 (Gr29587) and other groups and clusters of different richness (left panels), and the distribution of groups with at least four galaxies in Cartesian coordinates (right panels). Notations and details are the same as in Fig. 6. The maxima are located at 135 and 231 h^-1 Mpc (upper left panel, N_gal ≥ 50), and 131 and 233 h^-1 Mpc (lower left panel, N_gal ≥ 30).