Position-velocity diagrams of the H¹³CO⁺ emission along the transversal direction of the outflow. In the left panel, we show the redshifted H¹³CO⁺ and CO (3–2) integrated-intensity maps using the same contours and velocity ranges as in Fig. 1. The dashed lines in the left panel represent the cuts separated by 1″ that were used to obtain the PV diagrams reported in the right panels. The contours in the PV diagrams are [0.4, 0.6, and 0.8] times the peak intensity of the image, which is 0.05 Jy beam⁻¹ for every panel. The negative offsets refer to the northern part of the outflow. The dotted lines in the PV diagrams indicate the systemic velociy of the source, v_sys ~ 3.6 km s⁻¹. The text insets in both panels show the offset of each cut from the rightmost cut, which corresponds to an offset of 0″.