Ten of the 21 contours of magnetic field strength over-plotted on the inverted continuum intensity map. Red contours are based on the smoothed magnetic field strength. Yellow contours are based on the intensity and represent the boundaries of the sunspot penumbra. The greyscale bar ranges from 0.1 to 1.3; the extreme values of I_c/I_c<Quiet Sun> returned from the inversion are 0.097 and 1.468. The black arrow on the upper right part of the image points towards the solar disk centre.