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Fig. 3

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Normalized metallicity distribution of the stars without debris discs (SWODs, empty histogram), and the stars with debris discs (SWDs, blue histogram shaded at 0 degrees). Median values of the distributions are shown with vertical lines. Left panel: distributions of the stars in the homogeneous sample, i.e., metallicities computed from our own spectra. Right panel: distributions of the full stellar sample (see text).

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