One example of the alignment procedure of the VLBA images for the frequency pair 8.4 and 15 GHz. Top: images of the CLEAN model convolved with the natural restoring beam, with a mask applied for 8.4 GHz (left) and 15 GHz (right). Including the eastern jet emission resulted in a small nonphysical shift. Hence a mask was used to cut out the whole eastern jet and to only account for the emission of the western jet for the alignment. Bottom: contour maps without (left) and with applied shift (right).