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The “3R theory” of Ca alternans. (A) A schematic plot illustrating that a CRU has primary sparking probability α, and once it sparks, has a probability γ to recruit a neighbor to spark. (B) The alternans (ALT) region in α-γ parameter space obtained from Eq. 7 for β = 0.98 and different number (n) of neighbors. (C,D) Spark number Nk versus beat number k in the NO ALT region and in the ALT region.
