Fig. 1.
Left panel (red points): fast sample of stars (202 sources) with assumed spurious tangential velocities greater than 100 km s−1. Right panel (blue points): slow sample of stars (625 sources) with tangential velocities less than 100 km s−1. The fast sample, 24% of the total, are clearly clumped within regions of high stellar density and/or strong nebulosity.
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