Velocity-integrated ¹²CO J = 3−2 line emission, similar to that shown in Fig. 3 left. At the center, the continuum peak emission is represented by a red contour, which probably traces the position of the stellar system (see Sect. 5). Above, the data are presented in a box of 8.8′′× 4.8′′ in size, and 4.0′′× 2.2′′ in the plot below. Ellipses are plotted to help visualize the departures from symmetry, and the synthesized beam is shown in the right bottom corner of both plots. More details in Sects. 3 and 6.