Stokes profiles of the He i 10 830 Å triplet (four top panels) and the Si i 10 827 Å line (four bottom panels) at coordinates x ~ 20′′ and in Fig. 5, on July 5, 13:39–13:58 UT column (see white arrows). The selected point is located inside the dark He i threads. The dots represent the observed profiles which were binned in order to obtain a larger S/N. The solid line corresponds to the best fit achieved with a Milne-Eddington/LTE inversion code for the upper/lower panels. Stokes Q and U present the typical Zeeman-effect three-lobe signature. For helium the abscissa indicates the wavelength, while for silicon it shows the distance to the Si i line core center in Angstrom units. The fit of the helium Stokes profiles provided the following magnetic parameters B_He = 592 ± 31 G, γ_He = 69.6° ± 0.8°, and φ_He = 115.5° ± 0.3°, while the silicon inversion gave B_Si = 1185 ± 22 G, γ_Si = 71.7° ± 1.1°, and φ_Si = 53.7° ± 1.3°. A filling factor of f ~ 0.7 was inferred from the SIR inversion.