Mass dependence of Q.S. Left panel: dependence in all environments in our sample of cluster candidates. Middle and right panels: dependence in two subsamples divided by local density (same bin division as in Fig. 5). The number to the left of each data point is the number of RQGs in this mass bin, while the number to the right is the number of QGs. The total number of QGs or RQGs in the middle and right panels is the same as the number of cluster candidates in the left panel. Errors are propagated based on the Poisson statistics for each population in each bin.