The H I mass (M_{H I}) versus velocity line width (W₅₀) distribution for the gaseous dwarf sample (Table A1). Scatter points in the central panels represent individual H I–emitting dwarf galaxies; histograms in the corner panels show the marginal distribution. Left: symbols distinguish the H I surveys, and shadings in the central and right-hand (M_{H I} marginal) panels show the corresponding H I mass sensitivities. Right: the full sample (circles; combining three surveys) compared with the Local Group gaseous dwarf population in the central panel (light red diamond symbols; M. E. Putman et al. 2021). Close satellites within the host galaxies’ projected R₂₀₀ are shown with filled symbols as in Figure 3 or shaded histograms in the marginal panels.