The animation to the right shows a 3D reconstruction of an impacted target from the 1992 campaign. The sphere is 21cm in diameter and made of alumina cement, impacted from below using a contact charge. The trajectories shown are those of all fragments identified in 3D in this shot. Each trajectory has a cross marked on it, indicating the point at which it is recognised in both cameras (below this point the trajectory is based upon a parabolic fit to the known 3D points).
The envelope of trajectories is somewhat elongated and asymmetric; this is due to the positions of the cameras used. They were 60 degrees apart (so that the cameras and target combined to form an equilateral triangle), so the combined field of view is a parallipiped. Although the trajectories can be extrapolated beyond this region there is no scientific reason to do this.