PV diagram of three selected transitions from CH₃CN across VLA4A and VLA4B (west to east). The contour levels are at 5, 10, 15, and 20σ. The dashed lines indicate the position and velocity of VLA4A (blue) and VLA4B (orange). The solid curves show Keplerian profiles for each with a M_star = 0.27M_⊙ and θ_inc = 22° for VLA4A (blue) and M_star = 0.60M_⊙ and θ_inc = 40° for VLA4B (orange) according to Diaz-Rodriguez et al. (2022).