Ratio of [O I] 145 µm / [O I] 63 µm line intensities emitted from the surface of a PDR as a function of the cloud density n, and the FUV flux incident on the cloud G0 .     Models of Kaufman et al. 1999 are used with the standard model parameter set.

Ratio of [O I] 145 µm / [O I] 63 µm line intensities
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