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Published online by Cambridge University Press: 09 April 2001
Equations (10)–(12) and (14)–(16) of this paper, as well as the paragraph following (16), contain errors and should be corrected as follows (primes indicate corrected equations). The corrections do not alter the analyses and conclusions in the remainder of the paper.
Article appeared in Laser and Particle Beams (1998), 16, 295–316