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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 (https://creativecommons.org/licenses/by/4.0/).
Index correlation analysis: (a) linear fitting of FI and V; (b) linear fitting of 1/FI and 1/V; (c) linear fitting of FI and FT; (d) linear fitting of 1/FI and 1/FT.