Effect of ionic densities n_O0 and n_H0 and propagation angle on wave-phase velocity, (a) Effect of n_O0, where n_O0 = 30 cm⁻³ (orange), n_O0 = 40 cm⁻³ (dashed mint green), and n_O0 = 50 cm⁻³ (dot-dashed pink), (b) Effect of n_H0, where n_H0 = 15 cm⁻³ (dashed orange), n_H0 = 16 cm⁻³ (dashed mint green), and n_H0 = 17 cm⁻³ (dot-dashed pink). Other plasma parameters: n_sp0 = n_se0 = 17 cm⁻³, T_e = 10 eV, and B₀ = 80 × 10⁻⁵ G. We test the effects of the following propagation angles: θ = 85° (multicolored curves), θ = 80° (magenta curves), θ = 70° (blue curves), and θ = 60° (purple curves).