Figure 5

Figure 5: The final event horizon of a black hole is only known when the infall of matter has stopped. Radiation at 1 collapses to form a small black hole which settles down, but later more radiation at 2 falls in to give rise to a larger final mass. Fine-tuning of a parameter may result in m1 ∼ (p − p∗)γ, but the final mass m2 would be approximately independent of p.