(color online) Plots of dissipative coefficient B as a functions of population of non-thermal ions α for different density ratios: δ₁ and δ₂ when ρ₁ = 0.1, ρ₂ = 0.4, and ν = 0.2. Here orange (lower solid) curve represents δ₁ = 3, δ₂ = 10, dash curve represents δ₁ = 3/2, δ₂ = 4, and blue (upper solid) curve represents δ₁ = δ₂ = 2.