Summary of runs performed in LVG approximation, compared with the reference case (run 2, left panel). The central panel refers to the analysis performed on the high-J transitions for DCO⁺, H¹³CO⁺, and C¹⁸O, whilst the low-J ones are used in the map in the right panel. The white contours are the same as in Fig. 2. Note that the colour scale is the same across all the panels. The beam size and scalebar are shown in the bottom left and right corners of each panel.