Communicating between stations in a network is described. In one embodiment, the three-dimensional position locating system includes a housing including a substantially planar surface. The modem may be configured to transmit and receive orthogonal frequency division multiplexed data signals that comprise a plurality of sub-carriers, wherein the modem is adapted to vary the transmit power for each of a plurality of subsets of the plurality of sub-carriers from substantially zero power to a plurality of increments above zero power. , and the volume resistivity is 1\xd71014 \u03a9\xb7cm or higher. If the replacement is legal, the method retains the simple object allocation in the program code. The first and second correction units located between the deposition source and the treatment object.