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The S-layer differential transform, based on the late time approximation of a thin conductive sheet, was applied to<br>Time Domain Electromagnetic (TDEM) sounding data acquired in order to delineate an iron ore prospect.<br>Although giving very good results on synthetic data, the S-layer differential transform is extremely sensitive to<br>noise in real data. This is due to the fact that the method requires two successive numerical differentiations which is<br>an extremely unstable procedure.