Fig. 6.
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Observed spectra (solid black) normalised and vertically shifted for presentation purpose, compared to synthetic spectra (solid blue) in the wavelength range of the 868.86 nm Fe I line and the best fit of the Fe feature (solid red). The spectra are ordered in decreasing metallicity, from top (the most metal-rich) to bottom (the most metal-poor): Scl 12, Scl 19, Scl 9, Scl 29, and Scl 2.
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