Survey completeness, that is, ratio between number of detected sources and number of simulated sources, and corresponding survey area for AGNs detected in the 0.5–7 keV (solid blue line), 0.5–2 keV (dashed red line) and 2–7 keV (dash-dotted green line). In the left panel we report the curves obtained in the AXIS deep survey, in the central panel those obtained in the intermediate-area survey, and in the right panel those obtained in the wide-area survey. In the central panel, the 0.5–2 keV completeness curves for the deep and wide surveys (dotted gray lines) are also plotted for comparison.