Position-velocity plots along the direction with PA = 68° passing through the HMC. The offset is measured from the phase center, positive toward NE. Contours correspond the CH₃CN(12–11) K = 4 component emission, while gray scales indicate the ¹²CO(2–1) and ¹³CO(2–1) line emission, as indicated in each box. Contour levels increase from 0.2 in steps of 0.2 Jy/beam for CH₃CN, from 0.24 in steps of 0.24 Jy/beam for ¹²CO SMA, from 0.6 in steps of 1 Jy/beam for ¹²CO SMA+30 m, from 0.12 in steps of 0.175 Jy/beam for ¹³CO SMA, and from 0.15 in steps of 0.5 Jy/beam for ¹³CO SMA+30 m. The cross in the bottom left of each box denotes the angular and spectral resolutions.