Top panel: overlay of the line velocity (moment 1) map of CH₃CN K = 2 (12–11) (colors) on the SiO (5–4) blue-shifted (blue contours) and red-shifted (red contours) averaged emission. The CH₃CN K = 2 line velocity map has been computed over the velocity range (92, 100) km s⁻¹. The velocity intervals over which the SiO emission has been averaged are indicated in the upper left-hand corner. Contour levels are the same as in Fig. 5. Middle panel: overlay of the CH₃ CN K = 2 (12–11) and SiO (5–4) blue-shifted and red-shifted emission averaged over the same velocity intervals, which are indicated in the upper left-hand corner. Contour and grayscale levels are 6, 18, 36, and 72 mJy beam⁻¹. Bottom panel: same as the top panel but for CH₃CN K, l = (6, −1) v₈ = 1 (12–11). The synthesized beam is shown in the lower right-hand corner. The white crosses indicate the positions of the two compact free-free continuum sources detected by Cesaroni et al. (2010). The black dashed lines indicate the direction of the three possible outflows.