Shock excitation diagrams of most selected regions in the outflow. The best-fitting models for either J- (light blue) or C-shocks (dark blue) or a combination of each are indicated in the legend to each panel (see text for details). The sum of or the individual the best-fitting models is shown as a solid red line. The level populations of the various rotational levels of the (0–0) H₂ lines are indicated by plus signs if they are detection or downward pointing arrows for upper limits and are labelled as S(1), S(2), S(3), S(4), and S(5).