Proper motion in RA for the DANCe (x-axis) and UCAC4 (y-axis) catalogs. Only a random subsample corresponding to 10% of the total number of matches is represented for clarity. The left panel corresponds to sources fainter than K = 13 mag, the right panel to sources brighter than K = 13 mag. A dashed line corresponding to a linear relation is represented to guide the eye. A similar distribution is found in declination.