Flux comparison between eRASS1 and 4XMM catalogues. The upper panel displays the 0.2–2 keV fluxes of point sources. The brightest sources with at least 5σ flux measurements are plotted in red points with green 1-sigma uncertainties. The other sources are plotted in blue points without error bars. The black lines indicate 1:1 and deviation from 1:1 by a factor of 2. The lower panel shows a hard-band comparison for the Hard sources.