Contour-binned eRASS1 0.2–0.6 keV band surface brightness map in zenithal equal-area projection. Locations of big galaxy clusters, overdense regions in source detection, and bins with sky area less than 1 deg² were masked. Counts from the non-X-ray background and all eRASS1-catalogued sources (Merloni et al. 2024) were also removed from this image (but not in the spectra; see Sect. 2 for more details).