Schematic diagram showing the positions of the four components seen in the 5 GHz images shown in Fig. 1. Open circles represent the positions of the centroids of B, C, and D with respect to A in the epochs 1997.6 and 2009.4. Error bars correspond to 20% of the beam sizes. The arrows indicate the direction of the components’ displacements. The length of each arrow is proportional to the magnitude of the respective displacement.