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Fig. 10.


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Extinction vs. distance. The blue points correspond to the results obtained for the distance (see Table 2) and extinction AKs (Table 4) obtained for the spiral arms features. The dashed red line shows a linear fit of the data points, two by two. The green error bar indicates the systematic uncertainty of the extinction, which does not affect the relative variation between arms because all the arms are affected in the same way.

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