[Na/Fe] vs. [O/Fe] for the sample stars compared with stars of NGC 6121. Symbols: present work: green filled squares: the 6 HP 1 stars with [Fe/H] = −1.0 ± 0.05; open green squares: the 2 HP 1 stars with [Fe/H] = −1.18; compared with blue filled triangles: stars of NGC 6121.
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