Stokes V profiles over a spectral range covering the Sii 10 827.1 Å  line and Hei  triplet at 10 830 Å. Positions of the plotted profiles are indicated by a red line in Fig. 1d, the lowermost profile belongs to the pixel closest within the sunspot to the sunspot center. Since the Stokes V signal in the Hei triplet is weaker than the Sii  line, it is magnified by a factor of 2.5 (see box). The right side of the axis in the plot gives the distance, r, in seconds of arc from the lowermost profile. Profiles plotted in red indicate the position of the polarity inversion line and those colored in blue indicate the nearest profiles with clearly visible opposite polarity. A yellow profile at marks the transition from the penumbral region to the quiet Sun.