Figure 6: 𝑏 1 = 2 ; 𝛽 1 = 0.0025 ; 𝛽 2 = 0.65 ; 𝛽 3 = 0.75 ; 𝛾 ℎ = 0.000045 ; = 0.2 ; 𝛽 = 𝛿 = 0.0025 ; 𝑅 𝜇 V 1 ℎ