(Color online) The ESPPs (with ϕ ( 1 ) > 0 ) for u 0 = 0.01 , σ = 0.25, μ = 0.7, κ 2 = 3 , δ = 15, α = 0.5, κ 1 = 10 (dashed curve), κ 1 = 15 (solid curve), and κ 1 = 30 (dotted curve).