Observed and best-fit Stokes profiles and corresponding non-LTE models. The three example profiles (normalized by – the mean intensity in the “quiet” part of the FOV at the bluest wavelength) correspond to the markers shown in Fig. 3. Observed and synthetic T_b [3 mm] values are indicated on the right. The solid lines and vertical bars in the top panels show the median and the range between the 16th and 84th percentiles of the Monte-Carlo distributions at each optical depth grid point.