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Fig. 4


LVG results for the [ CI ] line flux ratios observed in the galaxy sample. The panel contains lines of constant model flux ratio, as a function of H2 gas kinetic temperature Tk and volume density n(H2), for distinct C column densities NC/dV. Curves are depicted in groups of constant line ratio [ CI ](10)/[ CI ](21) = 1 (left, bottom), 2 (middle), and 3 (right, top). Within each group of ratios, curves are drawn for column densities N(C)/dV = 0.3 × 1017 cm-2/ km s-1 (dotted line), 1 × 1017 cm-2/ km s-1 (continuous solid line), and 3 × 1017 cm-2/ km s-1 (dashed line), respectively.

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