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Fig. 1

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MV vs. B − V color − magnitude diagram of the A-stars of our target sample. The stars with published ages are plotted with a green circle. Stars without a published age are noted with blue triangles and have been assigned an age of 125 Myr, based on their positions within the region defined by the Pleiades A-stars, which are indicated with orange stars. An empirical linear fit to the Pleiades is also shown. The older population of 625 Myr Hyades A-stars is plotted with blue squares.

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