Spatial distributions (in Galactic coordinates) of the parallaxes and proper motions of the Gaia-CRF2 quasars. From top to bottom: parallax (ϖ), proper motion in Galactic longitude (μ_l*), and proper motion in Galactic latitude (μ_b). Median values are computed in cells of approximately 5 deg². Maps are in the Hammer–Aitoff projection with Galactic longitude zero at the centre and increasing from right to left.