Channel maps of the CH₃CN(12–11) emission obtained by averaging the K = 2, 3, and 4 components. The number in the top left of each panel gives the corresponding LSR velocity. The values of the contour levels are indicated by the tick marks in the intensity scale to the right. The cross denotes the phase center. The ellipse in the bottom right of the last panel is the full-width-at-half power of the synthesized beam.