Fig. 6
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Elemental abundances in Cyg X-1 donor O star relative to hydrogen (upper panel) and iron (lower panel). The abundance ratios are relative to solar and in logarithmic scale. For comparison, the average chemical abundance of B stars in the Cyg OB3 (Daflon et al. 2001) and B stars in the solar neighborhood (Nieva & Przybilla 2012) are marked.
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