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D.B. Geselowitz and J. Ferrara comment on a paper by R.D. Throne and L.G. Olson which was published in ibid., vol.47, p. 452-62 (2000). Throne and Olson reply to these comments. The discussion concerns the use of a spherical model and a body surface Laplacian in the solution of the electrocardiographic inverse problem and the influence of noise.