Demonstration of our method with the ¹³CO (3–2) data ofJ16083070−3828268. Panel a: moment 0 map of the ¹³CO (3–2) emission in J16083070−3828268 obtained with the ALMA observations. Panels b–d: ¹³CO Spectra at the same de-projected radius of 0.′′5 but at different position angles in the disk, shown as red, black, and blue dots in panel a. Panels e and f: demonstration of stacking the three spectra with and without aligning them with the Keplerian velocities at their positions in the disk. Panels g and h final stackedspectra integrated over the entire disk with and without the alignment.