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Fig. 1.
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Hertzsprung-Russell diagram of various single non-rotating He-rich stars with different initial metallicities (Left panel: 1.0 Z⊙. Middle panel: 0.1 Z⊙. Right panel: 0.01 Z⊙.) evolving from ZAHeMS to central helium exhaustion. The blue dashed lines refer to contours of constant radii.
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