Cumulative histogram of the (β_∥, a, T_⊥, a/T_∥, a) occurrences over the quasi-stationary phase for protons (left) and electrons (right) in the HVM (top, ), HVLF (middle, ), and iPIC (bottom, ) simulations. The spatial region considered is the island interior, here defined by Ψ/max(Ψ) > 0.9. The full circles on top of the histogram represent the time evolution of the island-averaged anisotropy and parallel beta: black circles denote times over which the cumulative histogram is computed, while green circles represent earlier times. Curves are the same as in Fig. 5.