Left: maps of the brightness distribution (top row), obtained from the Stokes I spectra and the magnetic field components (row 2−4), obtained from the Stokes V spectra for UV Psc A (left column) and UV Psc B (right column). The surface is represented using the Hammer-Aitoff projection in order to preserve the relative area of different latitude bands. The central meridian corresponds to a longitude of 180°. The substellar points are located at the longitude 0° for UV Psc A and at 180° for UV Psc B. The colour bars on the right indicate the relative surface brightness and magnetic field strength in kG for each map. Right: observed (black histogram) and best-fit spectra (red solid lines) obtained from the ZDI analysis. The spectra for different phases are offset vertically, with the phase indicated next to each spectrum.