Position-velocity plots along the direction with PA = −45° toward the HMC A for a) CH₃CN K = 2, b) CH₃CN K = 8, c) CHCN K = 2, and d) CH₃CN K,l = (3,1)v₈ = 1. The offsets are measured from the phase center, positive to the southeast. Contour levels, which start at 3σ, are a) 0.03 to 0.39 by 0.06 Jy beam^-1, b) 0.009 to 0.099 by 0.018 Jy beam^-1, c) 0.006 to 0.055 by 0.012 Jy beam^-1, and d) 0.01 to 0.09 by 0.015 Jy beam^-1. The vertical solid line indicates the position of core A. The horizontal dashed line indicates the V_LSR.