Distributions of stellar mass M^⋆ for single galaxies (grey lines), satellites galaxies in LLGs and HLGs (light and dark blue lines, respectively), and BGGs of LLGs and HLGs (light red and dark red lines, respectively) for VO galaxies (left panel) and YS galaxies (right panel) in global luminosity–density regions D8 > 1. Solid lines show single galaxies and LLG members, and dot-dashed lines show HLG members.