Distribution of time separations between shots for 8 s intervals, ﹩t_{d}=1﹩ s, and ﹩R=2.0﹩. The region above 5.25 s has been fitted to an exponential. The slope above 5.25 s was ﹩0.74\pm 0.02﹩ s⁻¹ (90% CL); also note that the slope between 2.0 and 5.25 s (not drawn) was ﹩0.53\pm 0.02﹩ s⁻¹ (90% CL). The shot peaks are defined as the peak bins from the detection algorithm described in § 3.1.