Ratio of the [C II] 158 µm plus [O I] 145 µm intensity to the total far-infrared intensity emitted from the surface of a PDR as a function of the cloud density n, and the FUV flux incident on the cloud G0 .     We assume that IFIR = 2x1.3x10-4 G0  erg cm-2 s-1 sr-1. Models of Kaufman et al. 1999 are used with the standard model parameter set. A diagnostic plot combining the [C II]/[O I] and ([C II]+[O I])/IFIR ratios is available.

Ratio of the [C II] 158 µm plus [O I] 145 µm intensity to the total far-infrared intensity
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Please direct comments, criticisms, corrections and contributions to Marc Pound.
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