Dr. Won chose to comment on some of the earlier computerized interpretation schemes on the “inversion of a magnetic profile across a dipping dike” where he remarked that the schemes are often susceptible to (1) difficulty in absolute convergence, and (2) dependence of the final solution on the initially assumed model. Dr. Won described an iterative scheme which combines the differential correction and least-squares methods, and he claimed rapid convergence to minimum rms error. The scheme he proposed seems to be substantially the same as the one described by Rao et al. (1973), who also employed differential correction and least-squares criteria for the convergence of the solution. The flow chart given by Rao et al. (p. 714) clearly shows this. The only difference I could observe in the subject paper from that of Rao et al. is the imposition of certain allowable limits on each parameter of the dike to be determined so that the solution does not diverge. This is outside the principle of the method. Furthermore, no new scheme has been developed to eliminate the dependence of the final solution of the dike on the initial model; without such a scheme the conclusion arrived at in the paper, “that the final solution is independent of the initial choice of the model,” is not realistic.

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