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Fig. 1

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A Hipparcos HR-diagram for our entire sample. The three solid curves are Y2 isomass tracks set at a solar mass and with three different metallicities of  − 0.3, 0.0 and +0.3 dex running from left to right. These tracks highlight the changing position of the main sequence as a function of metallicity and we highlight this by dashed lines on either side of the thick solid Hipparcos main sequence. The dotted line is our cut to separate true subgiant stars from super metal-rich main sequence stars.

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