Magnetograms from HMI and SO/PHI-HRT on 7 March 2022. Top left: HMI 45-second LoS magnetogram at 00:01:30 TAI, with the SO/PHI-HRT FoV shown in yellow. The pixels outside the solar disc are set to black for clarity. Top right: SO/PHI-HRT 60-second magnetogram at 00:00:09 UTC. The pixels outside the field stop are set to black for clarity. Bottom left: Sub-region of the HMI magnetogram from the top-left panel, which has been re-projected to the SO/PHI-HRT frame of reference. Bottom right: SO/PHI-HRT magnetogram resampled to HMI resolution. The orange square outlines the regions used for the comparison. All magnetograms are saturated at ±200 G.