Histograms of mean proper motion differences between 2MAst HQ5b and UCAC4 HQ in 1 deg2 areas of the sky in right ascension (dpmx) and declination (dpmy). Top: north of δ = −30°, bottom: south of δ = −30°. The Galactic plane zone (| b | < 5°) was excluded. The outliers in each 1 deg2 area were excluded by a 3σ clipping. The fraction of areas with differences of less than 2 mas/yr is indicated in each panel.
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