Simulations of events per run and run length . Distribution of number of deletion events r composing each run when 1 - θ, the proportion of sequence deleted, is 0.5 (top left) and 0.9 (top right). ϕ = 0.5 in both cases. Distribution of run length for for ϕ = 0.5 (bottom left) and ϕ = 1 (bottom right). For visibility, all diagrams show highest frequency parts of the distribution only.