CSO33 and MMS9 maps of C¹⁸O (J = 2 −1) (in grey shades and black contours) with the 246.2 GHz continuum contours superposed (in green). The C¹⁸ O contours starts at 3σ (1σ = 4.8mJy/beam for CSO33 and 1σ = 3 mJy/beam for MMS9) with steps of 5σ. Continuum contours starts at 5σ with steps of 10σ (see Table 1 for the 1σ values). Thecomplete description for the molecular observations setup will be presented in a forthcoming paper (Bouvier et al. in prep.). Arrows are pointing towards CSO33-c and MMS9-d.