Intensity (first and third panels from the left) and circular polarisation (second and fourth panels from the left) profiles for channel 1 (first and second panels) and channel 2 (third and fourth panels) for all pixels in a region that covers 4 arcsec (i.e. 29 pixels) along the spectrograph slit indicated with a blue segment in Fig. 2. Red highlights the pixel we study in Figure 10.