Number of escaping H II and He II photons per second () as a function of time, for clusters in a minihalo (M_h = 10⁶ M_⊙) and clusters in an atomic-cooling halo (M_h = 10⁸ M_⊙). At each integer redshift value between 30 and 15 we generate 100 stochastic clusters and show the average number of escaping photons from these clusters at each timestep. Each of the four rows represents a different set of model parameters (see Table 2).