Fig. 10

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N/C vs. N/O diagram. The dashed lines show the CN and CNO equilibrium curves for the SMC (in fuchsia) and LMC (in black) using the respective baseline abundances from XShootU Paper I (Vink et al. 2023) and from Hunter et al. (2009), which was the same used by the LMC merger models of Menon et al. (2024, circles). The star symbols with green contours represent the ratios determined for SMC stripped stars from Pauli et al. (2022, six-pointed star), Rickard & Pauli (2023, seven-pointed star), and XShootU Paper VIII (Ramachandran et al. 2024, five-pointed star). The diamonds show the ratios of our sample BSGs and the fuchsia hexagons represent ratios determined by Evans et al. (2004a); Trundle et al. (2004); Trundle & Lennon (2005). Those do not provide He abundance determination, whose enrichment relative to the baseline is represented by the color scale applied to the symbols.
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