Same as Fig. 2, but for NGC 2451B. In this case, the efficiency of the astrometric selection in reducing the contamination of false positives classified as cluster members by previous studies (blue symbols) is apparent. Notice also a third peak at ϖ ~ 5.3 mas in the parallax distribution of the complete sample (black histogram), which corresponds to members belonging to NGC 2541 A in the foreground.
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