Flux ratio of the [C I] J = 1−0 to 13COJ = 2−1 line in the sample galaxies as a function of the [C I] J = 1−0 luminosity (left), and the total FIR luminosity (center); the panel on the right depicts the ratio of the [ CI ]J = (2−1) line to the 13CO line, again as a function of FIR luminosity. As in the previous figure, ratios derived from Herschel-SPIRE data are indicated by filled circles and filled squares, those derived from ground-based observations by open circles. Centaurus A and Perseus A are indicated by an additional cross. Linear regression correlation slopes and coefficients are from left to right: 0.27/0.42, 0.26/0.28, 0.28/0.32.
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