Model light curves constructed using the prescription of eq. (6). Both curves use ﹩\alpha =0.5﹩, ﹩\gamma =1.5﹩, ﹩\beta =1.5﹩ s, ﹩t_{0}=0.001﹩ s, ﹩b=1﹩ but two different values of the mean arrival time between shots. The corresponding parameter f takes the values ﹩f=3﹩ (Fig. 3a) and ﹩f=10﹩ (Fig. 3b).