Overlay of the CH₃CN peaks (circles) on the moment-8 map (contours) of the SiO(5–4) line emission. The colored points and black cross are the same as in Fig. 18. The maps have been rotated by 42° counterclockwise for consistency with Fig. 18 and the offsets are relative to the phase center of the observations. The contour levels range from 6 to 36 in steps of 5 mJy/beam. The ellipse in the bottom left corner denotes the synthesized beam of the SiO map.