Figure 17

Take \(\alpha _{1} =0.7, \alpha _{2}= =0.2, \alpha _{3}= 1.5, \alpha _{4}= 0.5, \sigma = -0.007\) for 3D and contour plots of Eq. (40).

Take \(\alpha _{1} =0.7, \alpha _{2}= =0.2, \alpha _{3}= 1.5, \alpha _{4}= 0.5, \sigma = -0.007\) for 3D and contour plots of Eq. (40).