Upper panels: distribution of groups richnesses (N_gal) with zero (red line), one (blue line), and two or more (green line) matches in comparison group catalogue. Lower panels: fraction of groups with zero (red line), one (blue line), and two or more (green line) matches as a function of group richness. Left panels: distribution and fraction for Bayes groups with matches in the FoF group catalogue. Right panels: distribution and fraction for FoF groups with matches in the Bayes group catalogue.