Fig. 3.
Histogram of the 7th-NNDs of the region around the cluster NGC 6633. The blue line shows the 7th-NND histogram of all the stars in that sky region in TGAS. Orange line shows the 7th-NND histogram of one realization of a random resample. Green line shows the 7th-NND histogram for the listed members of NGC 6633 (more visible in the zoom plot). The red line corresponds to the chosen value of ɛ in this region. The plot was made with the parameters L = 14 deg and minPts = 8.
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