P211 COMMENT ON THE STRUCTURAL INDEX USED IN EULER DECONVOLUTION FOR THE STEP STRUCTURE IN GRAVIMETRY R. PASTEKA Abstract 1 The commonly adopted structural index value used when applying Euler deconvolution to the step/contact in gravimetry is N = 1. An argument based upon analytical considerations and empirical data suggests that the value N = −1 is more appropriate. The precise interpretation of the derivation shows that the anomalous field from this structure is not homogeneous in Euler’s sense. However it is shown that after introducing a modification of the method using the interference polynomial concept (adopted from the known


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