Observed intensities of [O I](63 μm) and [C II] in M 33 with representative 1σ errorbars. The straight black line corresponds to a ratio of 1. The dashed black line corresponds to the average [C II]/[O I] ratio (Table 5). The red and blue dashed lines are the results of unweighted least squares fits to the TIR-bright inner and outer regions, respectively (Table 4).
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