Results on the vertical location for ¹²CO (pink line) and the inferred pressure scale height (blue line). The ¹²CO vertical location is obtained with ALFAHOR through the analysis of mock channel maps generated from a DALI model that uses the surface density prescription from Zhang et al. (2021) for each disk. Points extracted from the synthetic channel maps are shown in grey for comparison with the average value (z_CO). The inferred pressure scale height is calculated following Eq. (5). The pressure scale height used as input for the DALI models (H) is shown for comparison (yellow line). Dashed, dot-dashed, and dotted lines show the model location of the CO millimetre optical depths (τ_CO) 1, 10, and 100, respectively.