Comparison of X-ray fluxes from the 41 RASS (0.1-2.4 keV band) and eRASS1 (0.2-2.3 keV band) common detections. The solid line shows the log-log fit to the matched sources, while the dashed line indicates the 1:1 (unity) relation. RASS-only and eRASS1-only detections are plotted along the respective axes. Factor-of-two dotted lines (y = 2x and y = x/2) illustrate typical potential variability between the surveys.