Log-log plot of the fluctuation functions F_q(n) (black circle for q = 2) calculated for the final PDC time series presented in Fig. 5. The red curves correspond to q between −5 and 5 in steps of 0.2. Vertical dashed lines mark three domains of the fitting windows for the small n between 29.4min and 8.7 days, for middle n between 8.7 and 16.8 days and, for the large n greater than 16.8 days. The green dashed line gives the average slope H = h(2) = 0.95 for timescales shorter than 8.7 days.