Fig. 8.
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Age–[Fe/H] relation for the solar vicinity (7 kpc < RGal < 9 kpc, |ZGal|< 1 kpc), as a 2D histogram and as smoothed iso-density contours corresponding to 10 and 30 stars per bin. Overplotted are the 72 solar twins studied by Nissen et al. (2020), with the edge colour of the symbols corresponding to the groups defined by their Fig. 3.
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