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The effect of membrane voltage variance (σ2) on main determinants of the IBI. (A) Examples for typical APs of deterministic (thin dashed line) and stochastic (thin line) models. (Bold lines) Best-fit phase-4 depolarization linear slopes. (B) APD as a function of σ2. (C) End-diastolic voltage, vmin, as a function of σ2. (D) Phase-4 depolarization slope as a function of σ2.
