The invention provides lenses in which the maximum unwanted astigmatism is reduced and distributed over a wide area. The transformer circuit is comprised of a pair of coaxial cables, each having a desired characteristic impedance and each having a ferrite coupled thereto. From the next period, the target positions are determined by adding the positions at the time of initiation to the respective axial positions corresponding to the reference positions stored in the path cycle table, and a path table operation is performed. The computer system receives market data reflecting the one or more offers and generate a display of the received market data.