Left: Chandra image of the pulsar from the 2000 observation, registered to the 2011 frame. Right: matched Chandra image from the 2011 observation. Positions and errors (black circle: 2000; green ellipse: 2011) are taken from the FoM maps. The 2011 uncertainty includes the frame-tie errors added in quadrature (Table 3). The offset is significant at ≈4σ.