Fig. 11.
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Surface evolution of [Na/Fe] and [O/Fe] for 80–500 M⊙ models during core H burning at 1/30th Z⊙. The red circles represent detections of stars in NGC 5904, while blue triangles represent upper limits in [O/Fe] as defined by Carretta et al. (2009). The green dashed circle establishes the abundance ratios of field stars ([O/Na] = 0.6), with stars outside of it representing P2 stars.
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