The performance and the analysis of the various models to describe a few carefully selected experimental data show that only two out of the entire set of models, the "multi Cole-Cole" and Dias models, can provide a function with structure capable of fitting these data. This fact in addition to some basic characteristics of these two models, such as the way they were derived (empirically the former, fenomenologically the latter one) and the number of coefficients in the function (directly related to the degree of ambiguity of their determination), 7 coefficients in the former versus 5 in the latter model, make the author's model attractive and promising.


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