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Paced myocyte with an initial fraction of 0.2 for different combinations of release strength and refractory period: σ = 15 μM μm3/s, tref = 1.4 s (A), σ = 15 μM μm3/s, tref = 1 s (B), σ = 13 μM μm3/s, tref = 1 s (C). Each stimulation is indicated by a diamond symbol. Warm colors indicate substantial Ca2+ release site activity, while cool colors correspond to lesser Ca2+ release activity. Other parameter values are as in Table 1.
