Fig. 2
Top panel: portion of the reduced spectra for the subgiant stars in our sample; Y519, Y923, and Y1844 are plotted in black, blue, and red, respectively. A few atomic lines (Si I, Ti I, Fe I) used in our analysis in this region are marked by the dashed lines. Bottom panel: similar to the top panel, but for the turn-off stars in our sample; Y535, Y1388, and Y2235 are plotted in black, blue, and red, respectively.
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