Regions of stable replay predicted by the mean field model without inhibition (upper wedge) and with inhibition (lower wedge) for a network of 105 neurons. The gray level shows the number of iterations before replay fails as a function of the number of active neurons in a memory pattern and their common threshold. Black areas show stable replay over all 100 iterations. Inhibition allows stable replay of sparser patterns, thus increasing the capacity. White crosses mark the onset of stability in simulations of spiking neurons.