Fig. 4
[C i] 
CO 1–0 line intensity ratio predicted
by the KOSMA-τ PDR model for a spherical, centrally-condensed,
externally illuminated cloud core of 100 M⊙ as a
function of the surface density and the strength of the UV field. Contours are drawn
at ratios of 0.2, 0.32, 0.5, 1.0, and 3.2 to emphasise the region of interest.
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