Fig. 9.
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Distribution of Dn(4000) index of galaxies in various global density D8 regions. Upper left panel: all galaxies, upper middle panel: LLG (low-luminosity groups) satellite galaxies, upper right panel – LLG BGGs. Lower left panel: single galaxies, lower middle panel: HLG (high-luminosity groups) satellite galaxies, and lower right panel: HLG BBGs. Vertical lines show the values of Dn(4000) index Dn(4000) = 1.35, and Dn(4000) = 1.75.
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