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Previously numerical techniques for the inversion of the Schwarz-Christoffel conformal transformation developed by E. Costamagna (see ibid., vol.MTT-35, no.1, p.35-40, Jan. 1987) are used to compare the results presented by S. G. Pan (see ibid., vol.36, no.5 p. 97-21, May 1988). The results are shown to agree within about 0.1-0.5% in many cases, and seldom exceed some 1%.>
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Costamagna et al. (1991) studied this question.
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