Extract of three synthetic spectra of metallicity [Fe/H] = 0.0 dex (blue), [Fe/H] = −1.0 dex (red), [Fe/H] = −2.0 dex (black), showing the influence of the metallicity on an Fe I line (top left), an Fe II line at 6456.39 Å (top right), a Ni I line (bottom left) and a Ti I line at 6258.11 Å (bottom right).
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