Proper motion diagram of stars with Ks ≤ 19 mag. The dashed line marks the direction parallel to the Galactic plane, the dotted line is oriented vertically with respect to the Galactic plane and splits the proper motion diagram into the north-east and the south-west segment. Stars within a radius of 2σ as derived from the Gaussian fit in Fig. 7 (right panel) around the origin are selected as cluster members.
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