From left to right: maps of the longitudinal component of the magnetic field B_LOS, the field inclination γ with respect to the LOS, the magnetic field strength B, and the merit function χ² that result from the WFA applied to the line core wavelengths (top panels) and to the line wing wavelengths (bottom panels) for the entire sunspot as recorded at 08:13:22 UT. Red patches on the inclination maps are pixels where γ >  90°. Smoothed gray contours delimit the inner (dashed) and outer (solid) penumbral boundaries.