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Published online by Cambridge University Press: 26 February 2010
This communication concerns our paper which appeared, without proper proofreading, in Mathematika, 41 (1994), pp. 239–250. Listed below are corrections to those of the misprints/omissions which, in our judgement, most significantly interfere with efficient reading of the paper. We apologize for any inconvenience that may have resulted, and we thank the editors of Mathematika for an opportunity to make up the mistake.