(Color online) The electrostatic solitary potential profiles (ESPPs) with ϕ ( 1 ) > 0 for μ > μ c , u 0 = 0.01 , σ = 0.25, μ = 0.7, κ 2 = 3 , δ = 15, α = 0.5, κ 1 = 24 (dashed curve), κ 1 = 26 (solid curve), and κ 1 = 28 (dotted curve).