Position-velocity plots along the direction with PA = −45° toward the HMC A for a) CH₃CN K = 2, b) SO (10₁₁–10₁₀), c) HC₃N (37–36), and d) SO₂ (23_3,21–23_2,22). The thick white dashed and solid lines mark the border of the region where emission is expected for an edge-on Keplerian disk rotating about a 5 M_⊙ and a 13 M_⊙ point source, respectively. The offsets are measured from the phase center, positive to the southeast. Contour levels are the same as in Figs. 14 and 16. The vertical solid line indicates the position of core A. The horizontal dashed line indicates the V_LSR. The error bars in the lower left-hand corner of panel c) indicate the angular and spectral resolution of the data.