The present invention relates to a plug for the connection of wires, which provides sufficient retaining force for lead-in wires to prevent the lead-in wires from breaking, and provides contact resistance of predetermined value. The method comprises providing information about the harmonic response for the target sector of interest and a seismic source. For a load instruction, the terminating event that triggers invalidation for a particular scoreboard entry is the return of the load data. The role of the interface material is to make suitable contact to both the GaN and the metal so that the GaN, in turn, will make good electrical contact to the metallic conductor that interfaces the device to external circuitry.