Fig. 11
Masses of galaxy groups as a function of group total r-band luminosity. Blue points denote our data in the volume-limited sample with at least six group members. The red open squares and the red line indicate data from the literature (Popesso et al. 2007; Proctor et al. 2015). The grey lines show constant log (M/L) values of 3.0, 2.5, 2.0, and 1.5 (from top left to bottom right).
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