Left: Continuum emission at 1.33 mm in colour scale (see Sect. 2). The contours indicate the protostellar discs, subtracted from the image during the cleaning process. The first contours and steps are 30σ (13 mJy beam⁻¹) and 100σ, respectively. The black stars indicate the positions of the N and S protostars. Middle: Moment 0 map of the C¹⁸O emission (integrated between −10 km s⁻¹ and +20 km s⁻¹) in colour scale superposed to the 1.3 mm dust continuum emission in grey contours (from Bianchi et al. 2020). The first contours and steps are 10σ (1.8 mJy beam⁻¹) and 100σ, respectively. Right: Moment 1 map of the C¹⁸O emission in colour scale, 1.3 mm dust continuum emission in grey contours. The moment 1 map is generated using a threshold of 5σ (20 mJy beam⁻¹). The source systemic velocity (v_sys) is 6.4 km s⁻¹ (Mercimek et al. 2022).