Histograms of neutral gas mass in the AGN and non-AGN control galaxies. Colors and line styles are as in the upper panel of Figure 7, but changing the selection criteria of AGN. The upper panel shows the mass distributions for AGN-selected using instantaneous λ_Edd, and the lower panel shows the mass distributions for AGN-selected using the λ_Edd, min = 0.05. The samples being compared here are 𝒮_{M* & M200c}^WBH and 𝒞_{M* & M200c}^WBH.