In his reply to C. J. Swain's (1984) discussion Karl states that no one has disagreed with his proposed (0.265 mGal/m) "average value" for the normal gravity gradient and that his global terrain model can be used to challenge the validity of the traditional approach to data reduction. Our investigations show that Karl is in error on both counts, and we hope that the following analyses will help toward a clearer understanding of this question.

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