Effective (vignetted) eRASS1 exposure map (Galactic coordinates, Aitoff projection). The values in the map show the exposure time multiplied by the average of the ratio of the (vignetted) effective area to the on-axis effective area in the energy band 0.6–2.3 keV. Effective exposure values range from ~100 s at the ecliptic equator to more than 10 000 s close to the ecliptic poles (not visible on the colour scale of this image). The eROSITA-DE (western) Galactic hemisphere is on the right of the central meridian in this map.