Left: AXIS planned effective area as a function of energy (red solid red line), compared with those of the XMM-Newton pn camera (dashed magenta line) and of the Chandra ACIS-I camera (dashed blue line) as of early 2020, and with the ACIS-I one at the time Chandra was launched (solid blue line). The ATHENA effective area for a 5′ field of view (dashed cyan line) is also plotted for comparison. Right: AXIS (solid red line) angular resolution as a function of the off-axis angle. The same quantities are also plotted for ATHENA–WFI (dash-dotted cyan line; Nandra et al. 2013) and Chandra ACIS-I (dashed blue line).