There is disclosed herein an improved air and fuel intake system for a high performance internal combustion engine for installing on a supercharger or the intake manifold of the engine. The method may include determining when the transition between the first power mode and the second power mode is complete. In the course of either wave equation migration or reverse time migration, the pressures and particle motion velocities that need to be computed are sufficient to also compute the Poynting vector pointing in the direction of source-side or receiver-side wavefield propagation. The second circuit includes a second switch, a third switch and a second capacitor. The receivers are arranged transversely with respect to the conveying direction and disposed such that they are below the support member when the support member is at the unloading station.