If the jump processes are (to some approximation) independent of each other, the relaxation rates (R = 1/T1) of the two processes are additive . Following this assumption, a model containing two BPP-type jump processes was constructed and fit to the three datasets simultaneously (Figure ), revealing activation energies of 0.189 eV for the faster jump process (Figure , black dotted line) and 0.131 eV (Figure , red dotted line) for the slower jump process. Comparison between fits using the standard spectral densities (1-4) are shown in the SI Figure .