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Fig. 7
Evolutionary tracks using the Geneva Stellar Models (Ekström et al. 2012) for solar metallicity and a rotation rate of νini/ νcrit = 0.4 on ZAMS (it corresponds to 170 km s-1 for an initial mass of 20 M⊙). Initial masses are: 9, 15, 20, and 25 M⊙. The position of X1908+075 is marked by the red star.
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