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In this letter, we describe a very general procedure to obtain a causal fitof the permittivity of materials from experimental data with very fewparameters. Unlike other closed forms proposed in the literature, theparticularity of this approach lies in its independence towards the material orfrequency range at stake. Many illustrative numerical examples are given andthe accuracy of the fitting is compared to other expressions in the literature.

Extracting an accurate model for permittivity from experimental data : Hunting complex poles from the real line