Upper panel: SiO (5–4) map of the FIR 6 region, integrated from −12 to 15 km s⁻¹ (black contours), overlaid with the CO (6–5) outflow emission (blue and red contours; as in Fig. 1). The SiO contour step is 3σ, with the firstcontour at 3σ (σ = 0.38 K km s⁻¹). Lower panel: SiO (5–4) spectrum (black) averaged over the region indicated by the green polygon on the top panel. To increase the signal-to-noise ratio the spectral resolution was smoothed to 2 km s⁻¹. As comparison the CO (6–5) spectrum is shown in red.