Position-velocity diagram for SO₂ 18_4,14–18_3,15. Left: emission above 3σ% employing a PA of 157°. The blue and red dots represent blue- and redshifted emission peaks above ±3 km s⁻¹, respectively. The black line represents an infalling-rotating profile with M_* = 1.5 M_⊙, an inclination of 70°, and r_CB = 0708 (magenta dashed lines). The r_CR is shown by the green dashed lies. Center: zoomed-in version for the redshifted emission. Right: zoomed-in version for the blueshifted emission. The systemic velocity is 3.7 km s⁻¹.