ALMA observational results of RY Lup (top row), J16083070−3828268 (middle row), and Sz 83 (bottom row). Panels a–c: moment 0 map (contour) overlaid on the moment 1 map (color; in units of km s⁻¹) of the ¹³CO emission. Green lines denote the axes where the PV diagrams are extracted. Contour levels start from 3σ in steps of 3σ, where 1σ is 77 mJy km s⁻¹ in panel a, 74 mJy km s⁻¹ in panel b, and 44 mJy km s⁻¹ in panel c. Panels d–f: PV diagrams of the ¹³CO emission along the major axes and passing through the stellar positions. Blue and red data points denote the measured peak positions in the high-velocity channels, and green curves present the fitted Keplerian rotational profiles to the data points. Contour levels start from 2σ in steps of 2σ, where 1σ is 35 mJy km s⁻¹ in panel d and 50 mJy in panels e and f. Panels g–i: stacked ¹³CO spectra with (red) and without (black) alignment integrated over the disk area. Zero velocity refers to the measured V_sys. Red and black horizontal dotted lines denote ±1σ levels with and without alignment, respectively.