Multifractal analysis for PDC time-series following steps 5 and 6 presented in Sect. 4. Top panel: original (in red), shuffled (green), and phase-randomised (blue) data are based on the procedure mentioned in Sect. 4. Left top: multifractal fluctuation function F_q (n) obtained from MFDMA method for only q = 2, indicated henceforth as a big circle. Right top: q-order Hurst exponent (h(q)) as a functionof q-parameter. This panel shows the truncation originated from the leveling of the h(q) for positive q. Left bottom: comparison of the multifractal scaling exponent τ(q) of three data. In this panel, it is possible to identify a crossover in q ~−1. Right bottom: multifractal spectrum f(α) of three time-series, respectively.