FFT power spectra along each column for the l.o.s velocities and magnetic field strength presented in Fig. 10. The axis labeling at the top indicates the average magnetic field inclination obtained through averaging over the right panel of Fig. 10. More inclined field is found in the outer penumbra (x = 0), more vertical field in the umbra (right side of the panels). The solid horizontal line indicates the 3 min mode, whereas the horizontal dashed line indicates the 5 min mode.