Left: CO⁺ integrated emission (see Fig. 1). The pink dashed line indicates the direction of the intensity cuts. The colored circles indicate the positions where spectra were extracted. Right: panel A) to E) show the intensity cuts (red continuum lines) of CO⁺, H¹³CO⁺, [Cii], H₂, and PAHs. In these panels, the gray continuum lines indicates the errors in the cuts. Panel F) shows the comparison of the intensity cuts scaled to unity. In panels A) to F), the pink dot-dashed lines indicate the 3σ level for each species and the gray area indicates the position of the UC Hii region. Panel G) shows the CO⁺, [Cii], H¹³CO⁺, and HCO⁺ spectra at IF, MP2, and PDR3. The color of the boxes are related to these positions (circles in left panel).