Fig. 1
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Atmospheric parameters of the target RGB stars. Stars observed in different programmes are shown in different symbols and colours: orange triangles – 072.D-0777(A), grey circles – 073.D-0211(A), blue diamonds – 088.D-0026(A). The Yonsei-Yale isochrone of 12 Gyr and [M/H] = -0.68, and [a/Fe] = +0.4 is shown for comparison as a red solid line (Kim et al. 2002).
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