PDR diagnostic diagrams for observed fine-structure lines – based on the PDR models of Wolfire et al. (2010) and Hollenbach et al. (2012). Top: [C ii] 158 μm/[O i] 63 μm versus ([O i] 63 μm + [C ii] 158 μm)/ΣFIR. Middle: [C ii] 158/[O i] 145 versus ([O i] 145 μm + [C ii] 158 μm)/ΣFIR. Bottom: [C i] 370/ [C i] 609 versus ([O i] 145 μm + [C ii] 158 μm)/ΣFIR with the density grid extended down to log n = 2. In each figure the blue and red points represent the values found for IRAS 23133+6050 and S 106 respectively.
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