Fig. 1
Sky density per square degree for the quasars of Gaia-CRF2 on an equal-area Hammer–Aitoff projection in Galactic coordinates.The Galactic centre is at the origin of coordinates (centre of the map), Galactic north is up, and Galactic longitude increases from right to left. The solid black line shows the ecliptic. The higher density areas are located around the ecliptic poles.
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