Fig. 4
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Example of fit carried out by optimisation code GAUGUIN for Mg line 5183.6 Å (left panel) and the left wing of the Ca line 8662.14 Å (right panel) in a solar-type star. The normalised observed spectrum is shown with red open diamonds, while the solution is indicated by blue crosses. The reference synthetic spectra grid is colour-coded according to [α/Fe] (left panel) and [Ca/Fe] values (right panel).
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