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Determination of Tex. Triangles – Δ and ρ/Δ values obtained in calculations with various Tex. Solid line – the 5th order polynomial approximation. Arrows indicate the extreme positions. Top panels illustrate a “good” case when Tex is found reliably from Δ and ρ/Δ parameters. In the second case (lower panels) the Δ parameter exhibits a plateau in a wide range of temperatures and Tex can be found only from one parameter, ρ/Δ.
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