A data processing apparatus is arranged to map input data symbols to be communicated onto a predetermined number of sub-carrier signals of Orthogonal Frequency Division Multiplexed OFDM symbols. A particular solution relates to a method for generating the random number. The router is further configured to receive notification at the primary IM processing device of a reply from the sender’s processing device. The anode produces at least the first stage of collimation of the X-ray beam produced. The arcuate base is made up of an annular member having an axial component and a pair of upstanding ribs having flanges, wherein the arcuate base further comprises a high temperature capable material layer disposed on a surface of the arcuate base so as to define an inner diameter of the shroud segment. A spacer is then formed in a sidewall of the gate stack, and the second conductive impurity is ion-implanted in the sourcedrain regions, to form a fifth impurity region.