Comparison of the observed Fe LSD Stokes I profiles (black histogram) with calculations according to the diffusion theory predictions. The red solid lines show theoretical profiles for the iron distribution with log N_Fe/N_tot = −2.0 in the regions with the local field inclination ≥75° and log N_Fe/N_tot = −3.5 elsewhere. The green dashed lines correspond to similar calculation with log N_Fe/N_tot = −2.0 adopted for the surface regions with the field inclination ≥45°. Spectra corresponding to different rotation phases are offset vertically. Rotation phases are indicated to the right of each spectrum.