This slide shows another application of the dynalog file analysis. Here, a wedge pattern is treated, and all leaves should move synchronously, at constant speed. Its not the fluence that is plotted, but the deviation of each leaf from its planned value as a function of time, and only for carriage B, that means the left one. Everybody will see that the movement of leaf 14B is, well, extraordinary. And really, we had to replace the leaf motor 2 days later. So this may be used as an early warning system for hardware problems, because it is very sensitive.
(Note: upon beam-on, first the right leaves open as fast as possible while the beam is hold-off - this takes about 5 seconds - then the left leaves close in at constant speed and beam is on.)