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Fig. 7


Top: Y BGY TOTAL (left), Y VSGY TOTAL (right) versus the logarithmic Hα luminosity for the individual pixels in the disc of M 33 fitted with our code. Bottom: Y PAHY TOTAL versus logarithmic Hα luminosity (left) and dust surface density (right). The red squares and error bars correspond to the mean and standard deviation of the grain fractions for different bins in logarithmic Hα luminosity, which are overplotted to better show the trend between the quantities in both axis. The error bar corresponds to the median error: 0.04 for Y VSGY TOTAL, 0.02 for Y PAHY TOTAL, and 0.32 Y BGY TOTAL.

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