Left: [C II]/TIR intensity ratio versus TIR and corresponding FUV field G0, obs in M 33 (see Eq. (2) in Sect. 3.1). The large pink points and errorbars show binned ratios (Table 2). Errorbars represent the standard deviation of the data. The dashed line shows the result of an unweighted least-squares fit to log([C II]/TIR) = b + m × logTIR and all ratios, which gives m = −0.16 ± 0.10 and b = −2.64 ± 0.26, with correlation coefficient r = −0.39. For a few of the individual points 1σ errorbars are shown. Right: [C II]/TIR versus projected galacto-centric radius in M 33. The large pink points and errorbars show ratios binned over selected ranges of radii (Table 3).
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