Hertzsprung-Russell diagram for the observed stellar sample: black filled points show the stars with asteroseismic masses, triangles depict the stars in stellar clusters. The stars in the globular clusters NGC 2808 and NGC 4372 are shown with green triangles and brown squares, respectively. The Garstec evolutionary tracks (Serenelli et al. 2013) for different masses and metallicities are also shown.
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