CRL 618 in the 1998.89 (left) and 2009.60 (right) [S ii] images shown to the same scale and pixel size (0045). The two frames are aligned spatially and show how the jets move outward. The images have been rotated so that the y-axis lies more or less along the J1 axis. The two jet axes used in this work are also marked. The scale is indicated by the horizontal arrow. The images are displayed with a logarithmic scale (in arbitrary units). Feature A′ is labeled (see text).