The regional gravity analysis established by Coons and others (ibid., v. 51, no. 12, p. 2381-2399, 1967) synthetically by a power-series method does not necessarily incorporate the factor of matching the observed field at all. The power series with which the gravity is analyzed more closely fits a field as higher and higher order surfaces are involved. In other words, a power series gives an input for a good contouring program, but it cannot be employed to derive true residuals.

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