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Table 1:

Dust cross-section $\sigma $ at 250 $\mu $m as a function of radius in M 33, expressed in units of $1.1 \times 10^{-25}$ cm2 per H-atom.
r (kpc) 4 5 5.5 6 7 7.5
Polygons 1.8 1.02 .. 1.07 0.66 0.50
histo-N 0.65 .. 0.54 .. .. 0.48
histo-S 0.92 .. 0.95 0.69 .. ..
Model 0.8 .. 0.75 .. 0.66 0.5

Notes. The polygons are shown in Fig. 3. The histogram method was applied separately in the north and south (lines 2 and 3), leading to the ``Model'' values used to estimate the total H column density to make Fig. 4.


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