Distributions of the absolute magnitude (top panels), the spectral parameter η (middle panels), and the color index col (bottom panels) of galaxies in groups of various richness in the supercluster SCl 126. Left panels: the core (region D1); right panels: the outskirts (region D2). The populations are g10 (rich groups; ﹩N_{\mathrm{gal}\,}\geq 10﹩), g2 (poor groups; ﹩N_{\mathrm{gal}\,}< 10﹩), and ig (isolated galaxies; those galaxies that do not belong to any group). The Kolmogorov‐Smirnov test results for the difference of the distributions are in Table 5.