Total infrared continuum intensity (TIR) versus [C II] intensities in M 33. Intensities are given in erg s−1 cm−2 sr−1. Each point corresponds to one position on a 12″ grid at 12″ resolution, with an intensity 3 times above the local rms, for [C II], [O I], and TIR. Typical 1σ errorbars are shown. Colors correspond to the four different regions of the inner and outer galaxy, and above and below a TIR threshold, as described in Sect. 3.1. Straight lines delineate the results of unweighted linear least-squares fits to all data (drawn), the inner galaxy (dashed), and the outer galaxy (dotted) (Table 1).
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