Comparison between the imaging characteristics of RHESSI (top row) and STIX (bottom row). First column: Sampling of the (u, v) plane. Second column: PSFs. Third column: Central cut of the PSFs. Fourth column: Idealized PSFs obtained by fitting the central peak of the original PSFs. The top left panel describes a typical experimental (u, v) sampling from which some of the sampling points are missing because the corresponding visibilities did not pass the statistical quality check test.