The interesting analysis by Hammer seems to be founded partly on the approach of Heiskanen and Moritz (1967), in which a real gravity and a vertical gravity gradient are correlated according to the relation  
Δg/h=1/2π++[(ΔgΔgp)//((x2+y2))3/2]dx dy.
Here Δg denotes the free-air anomalies on a horizontal plane passing through observation point p and Δgp is the anomaly at p, the latter representing the center of the (x, y) coordinates.
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