Figure 4: Subspace volume-dependence of calcium fluctuations and open probability of a calcium-activated channel. Steady-state probability distribution for = (a) and (b) for the calcium-activated channel ( μM, μM^{−2} ms^{−1}) [29, 30]. (c) Steady-state and for integer multiples of the unitary volume and different rate constants for calcium binding (0.005 to 0.15 μM^{−2} ms^{−1}) with fixed.