Variations of amplitude of rightward traveling solitons with (a) κ_e for θ = 30°, θ = 45° for n_2d(1d) = 0.1, n_i(1d) = 0.4, T_1d(i) = 10^–5, T_2d(i) = 10^–4, T_i(e) = 0.1, M_1d(2d) = 150, ε = 0.1, and U₀ = 0.09; (b) n_i(1d) for θ = 45°, T_i(e) = 0.20, 0.25, 0.30 taking with the remaining parameters being the same as those in Fig. 5(a).