Some representative fits obtained with the empirical 3D model. In all panels the solid line represents the Hinode observations, the dashed line the synthetic profile computed with NICOLE. Upper left: spatial average over the entire field of view. Lower left: fit to a non-magnetic profile whose χ² is similar to the average χ² in all the non-magnetic pixels. The quality of this fit may then be considered as typical of the entire region. Right panels: fits to Stokes I (upper) and V (lower) profiles from a pixel with a magnetic signal whose χ² is similar to the average χ² in all the magnetic pixels. The quality of this fit may then be considered as typical of the entire region.