Total gas surface density versus the dust surface density for the H ii regions in our sample with fits presenting . We also excluded five regions that do not show CO emission. The colour code represents the morphological classification of the sample, as in Fig. 5. The continuous line represents the fit including only regions with Σdust< 0.06 M⊙/ pc2, while the dashed line shows the fit for regions with Σdust ≥ 0.06 M⊙/ pc2. a, b, and r represent the slope, intercept, and correlation coefficient of the linear fits.
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