A: Simulated voltage dynamics of model. SACs have Morris-Lecar dynamics, with local coupling occurring via diffusion of extracellular ACh, and a noisy channel to induce spontaneous firing. B: Traveling wave speed C as a function of threshold parameter A and refractory timescale ε, computed through numerical continuation. C: Blue points indicate frequency of wave-sizes from 5000s of simulation. Green line indicates fitted power-law distribution with exponent -1.23, coefficient of determination r2 = 0.98.