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Fig. 2.

image

Straight colour–magnitude diagram of the stars in the pink area of the proper-motion vector diagram of Fig. 1. The star cluster is indicated by the very clear-cut main sequence of close-by stars, well separated from a set of unrelated galactic background stars incidentally having the same proper motion. Axes are labelled by the names of the relevant quantities in the public Gaia DR2 tables; units are indicated.

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