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Fig. E.36
The spectrum of VFTS 538 (ON9 Ia + O7.5 Ia(f)) shows the characteristic of a SB2. The temperature is based on the He i λ4471 line. Ṁ is roughly based on the line shape of He ii λ4686. The line width of the absorption lines suggests a lower log g. The fit quality is rather poor and Teff and Ṁ are quite uncertain.
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