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Fig. 7
Chemical abundances (mass fractions) as a function of the radius around a 15 M⊙ star at the end of the MS (top panel) and a 120 M⊙ star (bottom panel) immediately before becoming a WR star. The bubble radius is 9.5 pc for the 15 M⊙ model and 83 pc for the 120 M⊙.
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