Data corresponding to ¹²CO J = 2−1 (in black) and ¹³CO J =2−1 (in orange) for three disks where modulations in the vertical surface are detected. Coloured dots indicate the extracted data from the channel maps for each tracer. Continuous lines trace the best-fit surface considering the reference baseline and a number of fitted Gaussians. The location and width of the Gaussians for each molecule are signaled at the top of each panel. Vertical blue lines trace the dust structure from Huang et al. (2018a). Vertical green lines show the reported kinematic residuals from Teague et al. (2021a) and Izquierdo et al. (2022).