Before revision:  Some of them follow traditional monofractal models consistent with fractional Brownian motion , while others exhibit complex multifractal dynamics  .
After revision:  Some of them follow traditional monofractal models consistent with fractional Brownian motion , while others exhibit complex multifractal dynamics . Regarding the source of multifractality, our results are mixed. Time series shuffling produces a reduction in the level of multifractality, but not enough to offset it. We find an association of kurtosis with multifractality .