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For original paper see ibid., vol. 33, no. 4, p. 1355-61 (1996). Comments on the equations of /spl sigma//sub x//sup 2/, /spl sigma//sub y//sup 2/ and /spl sigma//sub xy/. The derivations of these variances of the noises in r/sub x/, r/sub y/ and r/sub xy/ are not given. A reply is published.