The tunneling behavior between the two bright–dark solitons. Panel (a) shows the density of the bright-soliton component, (b) for the dark-soliton component. It is seen that the oscillating tunnleing behavior emerges during the interaction process. Parameters are w₁ = 2.9, v₁ = −0.05, w₂ = 3.9, v₂ = 0.05, and φ₁ = φ₂ = 0.