The H I versus stellar mass distribution of the gaseous dwarf sample (Table A1). Left: symbols distinguish the three H I surveys, with average H I sensitivities shaded as in Figure 4. Error bars show the binned means and standard deviations for the full sample (gray dashed line) and the deep subsample (orange dashed–dotted line). Right: shading indicates the position–velocity separation from the host (Section 3.5): dark gray for satellite candidates within R₂₀₀, light gray for objects outside R₂₀₀ but bound, and open symbols for unbound nearby galaxies. The Local Group gas-rich population are shown in light red.