Left panel: NGC 4666 C-band RM values for boxes from the center outwards to the edge of the disk for both sides of the galaxy; as in the right plot of Fig. 22 but with the approaching side mirrored. The left blue-shaded part of the plot indicates the axisymmetric disk magnetic field with magnetic field vectors pointing inwards, the yellow-shaded part of the plot indicates the axisymmetric disk magnetic field with magnetic field vectors pointing outwards, and the grey dashed line marks the radius of a possible field reversal. Right panel: NGC 4666 simplified disk model.