LVG results for the [ CI ]-to-13CO line flux ratios observed in the galaxy sample. The panels contain lines of constant flux ratio [ CI ] (1−0)/13CO (2−1) as a function of carbon and carbon monoxide column densities NC/dV and N13CO/dV. From left to right: a. model curves at (Tk = 20 K, n = 104 cm-3) for ratios [ CI ] (2−1)/(1−0) = 1, 3, 10, 30 (thick line), 100, and 300 increasing from right to left; b. as panel a., but for (Tk = 25 K, n = 3 × 104 cm-3); c. as panel a., but for (Tk = 30 K, n = 105 cm-3). The diagram axes are column densities for a velocity interval of 1 km s-1.
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