The M_HI and statistical S/N. In the main panel, the blue points and orange crosses show the H I-detected galaxies and clouds, respectively. Dashed lines have been placed at log(M_HI M_⊙) = 6 and 7, and S/N = 5 and 20. The top panel shows the number of detections for all H I-sources (black) and the galaxies and clouds using the same colours as the main panel. The top panel shows a severe truncation of H I-detected galaxies at log(M_HI/M_⊙) = 7, where the typical statistical S/N is 20.