Outflow–cloud interaction region in the western lobe of the DR2l Main outflow. The grayscale shows the integrated HCO⁺ emission between −50 and 50 km s⁻¹ relative to the source velocity. Red contours show line emission of HCN (top), H₂CO (middle), and HNC (bottom). Blue contours show the emission of N₂H⁺ and green contours show the emission of SiO, in all panels. Contour levels are at 5, 10, and 20 σ_rms. The dashed black lines in the middle plot mark the lines used to calculate the average intensities and first moments across the interaction front presented in Figs. 12–17. The orange rectangle marks the area actively affected by the interaction as derived from these intensities.