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The horizontal axis represents the y-axis and vertical axis represents z-axis. The elements along the z-axis are element 0, element 1, and so on, element i, and so on, element N minus 2, and element N minus 1. A distance between the elements N minus 2 and N minus 1 labeled, d. A distance between the elements 0 and i labeled, id. A distance from first element to last element labeled, left parenthesis N minus 1 right parenthesis d. The distance R sub 0 makes an angle theta with the z-axis. The elements N minus 1, N minus 2, and I are placed in the z-axis at points z sub start expression N minus 1 end expression, z sub start expression N minus 2 end expression, and z sub I respectively.