Fig. 9.
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Spectroscopic HR diagram of the analyzed sample with color and marker size scaled to N abundance. Solid black squares highlight stars with YHe > 0.12 and ϵN > 8.45 dex. As a reference, we show GENEC tracks with vini/vcrit = 0, 0.2, and 0.4 (solid, dotted, and dashed lines, respectively.) Blue segments correspond to phases with ϵN ≥ 8.45 dex.
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