Synoptic maps of the Ca K-line intensity (upper panel), unsigned (middle), and signed (lower panel) magnetic flux for CR1708. In the magnetogram (lower panel) the black and white halftones correspond to magnetic fields with negative and positive polarity. The Ca K-line observations are taken from the MWO, the magnetic field data from the NSO/KP. Two arrows point to dark circular voids (corresponding to sunspot umbrae) in the middle of bright plages. Panel c) is scaled between ±100 G (see scale on the right side of the panel).