Fig. 8.
Example of constraints on the number densities of hydrogen nuclei, nPDR, and the FUV radiation fields, G0, obtained for PLCK_G045.1+61.1 using the PDR models from Kaufman et al. (1999, 2006). Contours show the CO, [C I] and [C II] luminosity ratios, as labeled in the caption, with solid lines showing the average ratios and dotted lines their 1σ uncertainties.
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