Example of our multi-wavelength quality assurance scoring for candidate H I holes. Panels a–g: Each panel corresponds to the same hole (Hole 1) with the red ellipse marking its boundary and annotations in light blue giving the score for each feature. (a) H I moment-0 map showing a cavity. (b) H I line profile along the blue dashed line in panel a, used to quantify a 50% surface brightness depression. (c) H I velocity-dispersion (moment-2) map highlighting locally elevated σ_HI. (d1–d3) Individual H I channel map at representative velocities; the hole is visible in > 4 consecutive channels. (e) GALEX FUV map with bright emission coincident with the hole. (f) Hα emission map with strong flux within the hole. (g) Hα velocity-dispersion map with elevated σ_Hα inside the hole. Bottom row: Position–velocity (PV) diagrams illustrating the three morphological classes of holes following Brinks & Bajaja (1986). The PV panels here (left to right) show Hole 3 (Type I), Hole 2 (Type II), and Hole 1 (Type III). Hole 2 also suffers from a tidal interaction, see Section 4.