Fig. 5.

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HR diagram for Galactic stars. Tracks are from Limongi & Chieffi (2018) and have an initial rotational velocity of 300 km s−1. The dot-dashed lines show the full tracks. The thin solid lines show the parts for which 0.4 < X < 0.75. The thick solid lines show the parts for which in addition to 0.4 < X < 0.75, X(N) is larger than 0.0043. Symbols are the sample stars (filled triangles) and literature objects (open symbols); see text.
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