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Table 4.

Extinction values from the extinction maps.

Spiral # Reference AKs Δstat Δsyst
Arm stars (mag) (mag) (mag)
1 7756 0.12 0.02 0.06
2 13468 0.40 0.02 0.07
3 19594 0.93 0.02 0.07
4 24405 1.23 0.01 0.09

Notes. Column #reference stars indicates the number of reference stars used to create the maps. AKs indicates the mean value obtained for the stars in the selection boxes in Fig. 7. Δstat and Δsyst refer to the statistical and systematic uncertainty.

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