Position-velocity plots along the direction with PA = −45° toward the HMC A for a) SO (10₁₁–10₁₀), b) HNCO (16_1,16–15_1,15), c) SO₂ (23_3,21–23_2,22), and d) HC₃N (37–36). The offsets are measured from the phase center, positive to the southeast. Contour levels, which start at 3σ, are a) 0.009 to 0.081 by 0.018 Jy beam^-1, b) 0.04 to 0.24 by 0.04 Jy beam^-1, c) 0.025 to 0.275 by 0.05 Jy beam^-1, and d) 0.025 to 0.325 by 0.05 Jy beam^-1. The vertical solid line indicates the position of core A. The horizontal dashed line indicates the V_LSR.