Distribution of proper motions in right ascension (pmx = μαcosδ) and declination (pmy = μδ) in the chosen all-sky samples 2MAst HQ (blue solid line) and UCAC4 HQ (red thin line). Top: north of δ = −30°, bottom: south of δ = −30°. The number of objects in the long tails of the distributions extending outside the shown range of −50 ... +50 mas/yr are indicated at the histogram edges.
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