Fig. 5.

Relationship between the sample mean and the SD for the correlation decay in the selected temperature intervals. (A) T₁ = 370–400 K in the M phase. (B) T₁ = 455–465 K in the M phase. (C) T₁ = 590–650 K in the T phase. The lines are the fits to Eq. 7 with best-fit parameters indicated. Arrows at the top indicate the corresponding values of ΔT. (D–F) Histograms of ΔC(T₁, T₁ + 0.4 K) and ΔC(T₁, T₁ + 1 K) in the same three temperature intervals as in A–C. Dashed lines show the positions of the sample mean μ. The T phase histogram is unimodal with the mode exponent n = 1. The M-phase 455–465 K histogram is also unimodal, with n close to 2, while the 370–400 K histogram is multimodal with the mode exponent having an intermediate value.