TIR versus H I intensities in M 33. Intensities are given in erg s−1 cm−2 sr−1. Typical 1σ errorbars are shown. For H I we assume an calibration error of 15% (cf. K2013). The drawn line shows the result of an unweighted linear least-squares fit to log TIR = b + m × log HI, which gives a slope m = 0.48 ± 0.11, y-intercept b = 3.07 ± 1.32, and correlation coefficient r = 0.45.
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