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Fig. A.1.
Kiel diagram of 3 502 stars of the observed sample, with ep > 20%, colour-coded by [M/H] (top panel) and ep (middle panel). Only stars with S/N > 50 per pixel are plotted. The same stars are presented in the bottom panels in the [α/M] versus [M/H] plane, colour-coded by parallax errors.
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