The reconstruction generally succeeds but is imperfect in a number of interesting ways. Near the bottom and right side, the reconstruction fades away, especially where the dips are steeper. Bottom fading results because in modeling the data we abandoned arrivals after a certain maximum time. Thus energy needed to reconstruct dipping beds near the bottom was abandoned. Likewise along the side we abandoned rays shooting off the frame.
Difficult migrations are well known for producing semicircular reflectors.
Next is the problem of the spectrum. Notice in Figure 7 that the reconstruction lacks the sharp crispness of the original. Top is the spectrum of the the model, i.e. the left side of Figure 7 . Bottom is the spectrum of the the reconstruction, i.e. the right side of Figure 7 . Middle is the reconstruction times frequency f .