Three regions of interest showing significant magnetic evolution between the SO/PHI and SDO/HMI observations. The panels in each column show the same region as observed at different times, with the top row showing the earlier observation. Regions 2 (NOAA 12803) and 3 (NOAA 12797 and 12798) were first observed by SDO/HMI and were observed about two weeks later by SO/PHI (see dates and times above the panels). Region 1 (NOAA 12799) was observed in reverse order, first by SDO/HMI and then by SO/PHI.