Fig. 2.
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Normalised spectra of four RGB stars in the Sculptor dSph galaxy, all with [Fe/H]∼ − 1.7, for a range of S/N. The three CaT absorption lines for stars in the Sculptor dSph are marked at λλ8500 Å(EW1), 8545 Å(EW2), and 8665 Å(EW3). Vertical dashed black lines show the central positions of strong sky lines that can cause problematic residuals in low S/N spectra.
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