Fig. 1
Positions of the analyzed WN stars in M 31. Numbers correspond to the M31WR numbers as in Table 2. The background image is taken from Palomar STScI DSS. The size of the image is ≈1.9° × 2°. The gray dashed ellipse roughly corresponds to a radius of 9 kpc around the center of M 31, corresponding to the inner boundary of the region with the most star formation (van den Bergh 1964).
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