Left: overlay of the contour map of the HCO⁺(1–0) line (from Molinari et al. 2002) obtained by averaging the emission between –27.08 and –23.72 km s^-1, on the H₂ line (i.e. continuum subtracted) LUCI image. Contour levels range from 150 to 420 in steps of 90 mJy/beam. Like in Fig. 12, the area around stars A1, A2, and B has been blanked to mask an artefact caused by the continuum-subtraction process. Middle: overlay of the contour map of the 3.4 mm continuum emission (from Molinari et al. 2002) on the 2.2 μm continuum LUCI image. Contour levels range from 2.64 to 4.4 in steps of 0.88 mJy/beam. Right: overlay of the contour map of the 3.6 cm continuum emission (from Molinari et al. 2002) on the 2.2 μm continuum PISCES image. Contour levels range from 0.069 to 0.161 in steps of 0.023 mJy/beam.