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The (z, x) trajectory of the stochastic bursting (blue) at different levels of noise intensity D plotted with the bifurcations of the fast subsystem and the (z, x) projection of the resting state of the HR model when I = 1.25 (same as Fig. 3b). a D = 0.002; b D = 0.005; c D = 0.009. (Color figure online)
