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Fig. 1
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Example of spectra of our target stars. Top: star 6 in Grus II, a hot HB star whose spectrum is dominated by Paschen lines. Middle: the Ca II triplet (2nd panel) and the CH band (3rd panel) spectra of the RGB star 26 in Grus II. Bottom: CH band spectrum of the RGB star 4 in Grus II.
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