Surface density (upper panel), line-of-sight velocity and velocity dispersion maps (2nd to 4th panels) of the ClB in RHG097 at different times during the evolution. These images are taken at 90° projection (edge-on view) and the major axis of the bar is aligned with the X-axis. Clear signatures of rotation are seen at 4 Gyr. The colour bar at the top represents density, middle the velocity, and bottom the velocity dispersion.