Spearman’s correlation coefficient (SCC) between Alfvénic Mach number (M_A) and particle time series (I_e for electron intensity and I_p for proton intensity) as a function of the particle energy. Panel (a): SCC between log(I_e) and log(MA) as a function of electron energy for STA (red) and STB (blue). Panel (b): SCC between log(I_p) and log(MA) as a function of proton energy for STA (red) and STB (blue). The errorbars are defined by the range of SCC values obtained for the 100 magnetic field lines created using MHD cubes (for more details, see text).