Total cold gas mass per halo, M_cg (in M_⊙) vs. the number of massive (M_* > 10⁸ M_⊙) satellites in a halo. The left, middle, and right panels show log M_*C = 10.160–10.405, log M_*C = 10.453–10.715, and log M_*C = 10.931–11.288 bin halos. As in Figure 3, respective quartiles and 1σ ranges are marked. Note that, in the highest-mass bin, the median satellite-rich quartile, ranked according to N_sats (dark green cross), exactly overlaps with the corresponding median ranked according to the number of massive satellites (black cross).