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(A) Sources activity at a time sample. (B) Sources after binarization. (C) Point cloud defined by sources binarization. (D) 3DFD computation through the box-counting algorithm: log-log plot of number of boxes (N(r)) vs size (1/r) for voxelizations of sizes from r = 1 to r = 128. 3DFD computed as the slope of the regression line for box sizes from r = 8 to r = 64.
