x-t diagrams for the l.o.s velocity (left), the magnetic field strength (middle) and the magnetic field inclination (right) are shown in the top row. The umbra is on the right side of the panels, the outer penumbra on the left side (x = 0). The detailed magnetic field strength modulation for one spatial location (at x = 3.65, indicated with the white dotted line in the middle panel) is plotted in the bottom panel. The magnetic field inclination has been smoothed with a 3 pixels full-width-half-maximum Gaussian kernel.