(color online) Electrostatic potential () profiles due to the interaction between equal amplitude single solitons at different τ and β with inertial non-relativistic helium ions for both ultra-relativistic (γ = 4/3) and non-relativistic (γ = 5/3) degenerate electrons and positrons, where η1 = 0.6, λ = 0.10, μ = 0.40, k1 = 1 and σ = 0.5.
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