PSF radial profiles averaged over the ART-XC field of view in scanning mode: red solid and dashed lines show the profiles observed for a bright X-ray source during the CalPV phase in the 4–12 keV and 10–20 keV bands, respectively, and the blue line shows the profile obtained from ground calibrations (at 8.1 keV, see above). Dotted line corresponds to the ART-XC angular resolution (Table 1). Uncertainties are shown by thin black lines.