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Fig. 9

image

Correlation plot of I[ C ii ]/IFIR versus ICO (1 − 0)/IFIR. Edge-on model predictions for selected gas densities are plotted as lines. Dashed lines are for AV,los = 2.5, with dark gray corresponding to a gas density of nH = 3.0 × 103 cm-3, medium gray to nH = 1.6 × 104 cm-3, and light gray to nH = 4.0 × 104 cm-3; dotted lines are the same but for AV,los = 5.0; the medium and light gray dash-dotted lines are for AV,los = 0.5, with nH = 1.6 × 104 cm-3 and nH = 4.0 × 104 cm-3, respectively.

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