The abundance of H I–bearing satellites per host. Left: distribution of close satellite abundance (within projected R₂₀₀) per host, colored by survey. This histogram combines a range of host masses; we show the N_{H I sat}–M_host relation separately in Figure 9. Right: the HIMF of the gaseous satellites per host, defined as the number of gaseous satellites above a given mass, colored by the host halo mass. Right-pointing triangles mark the host sensitivity limit ﹩{M}_{{\rm{H}}\,{\rm\small{I}},{\rm{lim}}}﹩ for typical dwarfs (W₅₀ = 25 km s⁻¹). The MW and M31 are shown in gray for reference.