Abstract
The physical significance of the so‐called Dar Zarrouk curves (Maillet) is clarified and some new conclusions are drawn. A method is described for the quick and accurate construction of these curves based on the properties cited. The author illustrates the way to use them in solving different types of problems related to electrical prospecting, such as the determination of the limits of validity of the principle of equivalence, the depth of penetration, the possibility of differentiating between similar formations, etc. Five practical examples are discussed, and a template for use in the construction of Dar Zarrouk curves is included.

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