Fig. 3
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Observed HARPS-N spectrum of the SB2 system Mel20-S11 (black dots) around the Mg I b lines (λ 5160 Å, upper panel) and around λ 6440 Å (lower panel). In each panel the synthetic spectrum, which is the weighted sum of two standard star spectra mimicking the primary and secondary component of Mel20-S115, is overplotted with a full red line.
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