Fig. 3.
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Top panel: Diagram Δν − ΔΠ of three models of different stellar mass. Each point corresponds to a stage (Yc) in the evolution on the horizontal branch. The markers indicate the state of central helium abundance (Yc = 0.90, Yc = 0.40, and Yc = 0.10) and the appearance of the semi-convective layer. Bottom panel: Diagram Δν − ΔΠ of two models with different overshooting parameters αov.
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