Observed Stokes I profiles at different locations, indicated by the different symbols in Fig. 1b. Solid line (star symbol): quiet Sun profile. Dashed line (cross): He i emission profile. Dash-dotted line (triangle): very broad He i profile indicating multiple redshifted atmospheric components. Dotted line (square): deep absorption in the He lines, that is in part strongly blueshifted. The arrows mark the wavelengths at which images are shown in Fig. 4.