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Two equations in the Appendix of the title paper (see T.C. Ferree et al., ibid., vol. 47, p. 1584-92, 2000) included typographical errors. They should be replaced by the corrected equations given here. The errors were merely typographical. The authors have verified that the equations used to generate the numerical results in the original paper were implemented correctly. Consequently, the conclusions of the original paper are still equally valid. These corrections affect only readers wishing to reproduce the authors' results. The authors sincerely thank A. Liston for pointing out the errors. They apologize for any inconvenience.