Fig. 13.

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HR diagram showing the position of the two components of SSN 7 as determined by our spectrographic analysis. Black stars are the two SSN 7 components. Blue symbols are the other O stars within the central core of NGC 346 (Rickard et al. 2022). Open symbols are noted spectral binaries (Dufton et al. 2019). Dotted lines are isochrones with Z = 0.002 (Georgy et al. 2013) and an initial rotation of 100 km s−1.
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