Discs from the ARKS sample that have gas detections. The scattered light observations are the same as in Fig. 1. Overlaid on the scattered light images are the moment 0 maps for the gas observed with ALMA, using the robust values shown in Mac Manamon et al. (2026), i.e. 0.5 for β Pictoris, HD 121617, 49 Ceti, HD 131835 and 2.0 for HD 131488 and HD 32297. The ¹²CO (J=3–2 line) is plotted in white and the ¹³CO (J=3–2 line) in green, with the exception of β Pictoris where only the ¹²CO (J=2–1 line) is plotted, as this disc is not detected in ¹³CO. For every disc, there are 3 contour levels, corresponding to 3, 5, and 7 σ. The ellipses at the bottom left (white for ¹²CO and green for ¹³CO) represent the beam size for the ALMA observations. In all panels, North is up, East to the left.