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Fig. 15.

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Projected rotational velocity versus nitrogen surface abundances of the SB1s in our sample. The colour bar indicates the orbital periods of the systems. The baseline value for the nitrogen enrichment is equal to 7.78 and is marked by a dashed line. Cyg X-1, HD 130298, and HD 74194 are marked by a diamond, a triangle, and a square, respectively.

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