SAM of the gas: radial profiles computed along the equatorial plane. They are computed from the gas velocity in the model’s outputs, and from the velocity recovered with synthetic observations of the C¹⁸O (2−1) line emission. Model: black circles show 3D SAM computed considering the azimuthally averaged rotational (ν_ϕ) velocity component. Synthetic observation: Red crosses show the SAM computed from the maximum velocity. Green stars show the SAM computed from the intensity-weighted velocity (moment 1). Blue circles show the SAM computed from the Gaussian-fitted peak velocity. The shaded gray area represents the region beyond the velocity resolution. Red, green, and blue shadows show error bars on the synthetic data.