CH₃CN(37_k−36_k) first moment maps of the the k-levels 2 to 10 toward the central sources #1 and #2. The top left panel shows the corresponding integrated zeroth moment map of the CH₃CN(37₂−36₂) transition (integrated from − 13 to +10 km s^-1). The white contour outlines the 3σ level of 0.51 Jy km s^-1. The other panels all show intensity-weighted velocity maps, and wedges are shown above the k = 2 panels. While the k = 0 map was prepared without any clipping, the first moment maps are clipped at a 4σ level. The black contours present the 438 μm continuum emission in 4σ steps (1σ = 7 mJy beam^-1). The synthesized beams are shown for all panels, and a scale-bar (at 2.2 kpc) is presented in the bottom right panel. The diagonal line in the top middle panel of CH₃CN(37₃−26₃) marks the axis for the position-velocity diagrams shown in Fig. 9.