Methods and apparatus for allocating tones for communications purposes in adjoining cells of an OFDM system are described. A touch input area and a peripheral area aside to the input area are defined on the first plate. The method further includes the step of calculating a cerebral flow of the living subject based upon the corrected model and a selected cerebral blood flow perturbation. A quick release plate allows the clamp to be easily opened for disengagement. The first sidewall angle differs from the second sidewall angle by more than about 10\xb0. A resin member is provided on some portion of the upper substrate and has a bearing holding hole.