3D vector field of the dynamics of Tycho’s SNR based on our results. Top right and left: view along the y-axis (from above). Bottom right and left: view along the x-axis (from the right). The colors are the velocities V_z. The green arrows at left indicate the position of the observer and we added (in green) some indications of the zones seen by the observer looking at this plot. The lack of vectors for positions in the LoS z near zero, is due to a selection bias (see the text). A 3D visualisation is available online.