Left column: spatially integrated spectrum of the ¹²CO(3-2) (red) and ¹³CO(3-2) (blue) emission from HD 9672, HD 32297, HD 121617, HD 131488, and HD 131835 in the barycentric velocity frame. The ¹²CO spectra are additionally shown smoothed with a running mean (window size = 20), chosen to remove noise variation while preserving spectral features. Right column: radial profiles for the same discs. Radial profiles for HD 9672, HD 121617 and HD 131488 were created by azimuthally integrating the emission in each disc. The radial profiles for HD 32297 and HD 131488 (marked by *) are surface brightness profiles as a function of projected separation from the star along the major axis (rather than as a function of radius). For HD 32297, the radial distribution varies for each side of the discs so both sides are shown, in both ¹²CO and ¹³CO. For HD 131488, there is no significant differences between both sides of the disc, so an average radial profile is shown. The black radial profiles show the CLEAN dust profiles (Han et al. 2026). In each panel, the minimum value of R corresponds to the first resolution element of the observations. The red, blue and black horizontal bars indicate the resolution of the observations.