Position–velocity diagrams for the H2CO (30,3 –20,2) transition towards the two major cores MMS1a and b from the NOEMA data, with a synthesized beam of ≈ 0.43′′ × 0.35′′ (PA 61°). The cut directions are shown in Fig. 8. The bottom right PV diagram is from a cut through MMS1b, perpendicular to the left cut and along the inferred outflow axis (see Sect. 3.4). The white contour shows the 4σ detection threshold. The black vertical and horizontal bars indicate the position of the continuum emission peak and the systemic velocity, respectively. Their lengths correspond to 1′′ ≈ 4300 au and 14 km s−1. The black dots indicate the detection with the most extreme velocity at each position. The black solid curves indicate the Keplerian velocities, corresponding to the mass estimates in Table 4. The black crosses in the lower right corners indicate the resolution elements along both axes.
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