Beam shift effect for α Cen B in the VBB filter for a coronagraphic (CLC-MT-WF) Stokes Q frame (left) and the beam shift corrected frame (right) for essentially the same instrument configuration as the stellar PSF in Fig. 26. The arrow in the left panel points to the PSF peak transmitted through the mask. PSF residual features are marked in the left panel with “t” and “s” according to Fig. 8. In the right panel the arrow points to one of several spots from the camera, which show up because of the applied beam-shift correction. The squares at the bottom mark the area for the reported σ(Q).