Distribution of line of sight velocities relative to the systemic velocity of the Coma cluster. The red shaded histogram shows H I-selected galaxies in our WSRT survey while the black one represents confirmed Coma members based on the optical spectroscopy by Healy et al. (2021). The latter has been re-scaled to ease comparison. Dashed vertical lines mark the minimum and maximum velocities at which the WCS can detect H I emission. For more details on optical association see Sect. 2.3.