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Line intensity ratios for different combinations of the [N ii] (122 and 205 μm) and [C ii] 158 μm lines. Theoretical curves are shown by the solid, dotted, and dashed lines. Grey areas indicate the range of observed ratios, and the enclosing boxes represent the range of uncertainties in the ratios. The square point is the ratio of the [N ii] 122/205 lines.
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