Ratio of CO (J=2-1) / CO (J=1-0) 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 CO (J=2-1) / CO (J=1-0) line intensities
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WITS PDRT DIRT UMD

Please direct comments, criticisms, corrections and contributions to Marc Pound.
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