Fig. 7
Variance and comparison among \(\Delta F_{\mathrm{C}}\) and different reconstructed signals. a Variance associated with each IMFk obtained decomposing \(\Delta F_{\mathrm{C}}\) plotted as a function of the associated mean frequency \(< f_k>\). b A zoom showing a comparison among the original signal \(\Delta F_{\mathrm{C}}\) and the different signals reconstructed using Eqs. (7), (8) and (9), respectively. Data here considered are relative to Swarm A