Schematics of the geometry of the interaction and the initial paths of the galaxies. The orientation of the axes is given at the right, the dashed lines symbolise the direction of motion of the galaxies. The vectors L give the direction of angular momenta of the disc spins, indicated by the small arrows on the disc edges (labelled v_rot).The vectors v_ini sketch the direction of the initial velocity of the galaxies, the angle between it and the z-axis is β.