Survey area and exposure information of the eRASSl cluster catalog. Left panel: vignetted exposure map in the 0.2–2.3 keV band after masking regions. The clean exposure time changes from ∼0.1 ks to 1.2 ks in the survey. Right panel: cumulative eRASSl sky coverage as a function of exposure in the 0.2–2.3 keV band. Blue solid and dashed curves show the data before and after cleaning. The curve in cyan shows the depth of the eFEDS survey, as a comparison (Brunner et al. 2022).