Position–velocity plot of the ¹²CO(2–1) line emission along the direction matching the axis of Jet 2, i.e. with PA = −17°. The values of the contour levels are shown in the colour scale at the top of the figure. The offset is measured from an arbitrary position. The vertical and horizontal dashed lines indicate, respectively, the position of stars A+B and the systemic velocity of the associated clump. The white solid pattern encloses the region inside which emission is expected for the conical jet model that best fits the data (see text). The dashed pattern corresponds to the same model with a slightly different inclination angle (10° instead of 2°; see text).