Recently Skeels (1967) has considerably clarified the concept of the term "residual gravity" and has proposed a modified polynomial fitting method as a computational scheme. In the article Skeels refers to wavelength (or wavenumber) filtering discussed by Byerly (1965). Wavelength filtering has been recently applied by Zurflueh (1967) to the determination of residual aeromagnetic anomalies. Although Zurflueh compares wavelength filtering and least-squares polynomial fitting methods and mentions the pseudo anomalies introduced by the latter method, he does not discuss the effect of wavelength filtering on the shape of the residual anomaly.

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