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. 2020 Apr 27;12(5):1009. doi: 10.3390/polym12051009

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© 2020 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Selected permittivity spectra for the indicated salt concentration; ε′—solid marker; stars mark the low-frequency range $f_{\min}^{Z^{″}}$ … $f_{\max}^{Z^{″}}$ .