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1.H. Hinterberger and R. Winston, Rev. Sci. Instr. 37, 1094 (1966).
2.Hinterberger and Winston, (private communication). The case they actually considered corresponds to in our formulation.
3.By dividing Eq. (6) by one can show that the cone aperture relative to the modified paraboloid aperture is 0.617 at and approaches 1 as θ approaches 90°.