L_[C II]/L_TIR versus L_TIR in the molecular ridge in 12″× 12″ pixels. Yellow, blue, red, green, and brown colors refer to the regions outlined in Figs. 2 and 3. Gray points represent the pixels in the ridge outside of these regions. Data for 30 Doradus from Chevance et al. (2020) is added. The gray line represents the average minimum detectable [C II] line flux for S/N = 3. The large circles represent the ratio values for the whole ridge (cyan) and the three bright SFRs (N158: blue; N160: red; Nl59:green), relative to the mean L_TIR. The areas with filled colors represent observations from: Orion A (Pabst et al. 2021); M51 (Pineda et al. 2018); N11B (Lebouteiller et al. 2012).