Figure 3.

(Left) Cumulative distribution function $P(X>|r_{\mathsf{\Delta }t}\left|\right)$ calculated in 30-day windows. Two extreme cases of power-law tail are shown with the scaling exponent $\gamma \approx 1.8$ (mid February–mid March 2020) and $\gamma \approx 3.2$ (July 2019) representing stable and unstable distributions, respectively. (Right) Singularity spectra $f\left(\alpha \right)$ calculated in the same windows as above. An example of asymmetric, bifractal-like spectrum (mid February - mid March 2020) and an example of symmetric spectrum (July 2019) are shown together with characteristic values of the Hölder exponent: ${\alpha }_{\min }$, ${\alpha }_0$, and ${\alpha }_{\max }$ (see Equation (9) in Section 2.2).