H2 1-0S(1) 2.12 µm (Z = 3) line 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 . Contours are labeled with the line intensity in units of erg cm-2 s-1 sr-1. Models of Kaufman et al. 2006 are used.
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