A, stability boundaries plotted for multiple g
ks, with values of 50, 100, 200, 250 and 300% of the original value (0.0245 mS μF−1). B, stability boundaries plotted for three K
m, with values of 1.0, 0.5 and 2.0 μm corresponding to the black, red and green curves, respectively. C, ΔAPD vs. Δ[Ca2+]peak when g
ks is varied. D, slope (ΔAPD/Δ[Ca2+]peak) vs. g
ks. E, ΔAPD vs. Δ[Ca2+]peak when K
m is varied. F, slope (ΔAPD/Δ[Ca2+]peak) vs. K
m.