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Fig. 2

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Synthetic horizontal branch stars on the Hertzsprung-Russell diagram. Metallicity abundance, Z, is color-coded, as indicated in the key. The instability strip edges from Marconi et al. (2015) are plotted with lines whose color also corresponds to Z. Top panel: for MRG = 0.80 M⊙. Bottom panel: for MRG = 0.88 M⊙.
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