Fig. 6

The 3D, contour and 2D (when x = 100) graphs for the bell-shaped kink soliton solution \(\psi _{2, 5 }\) stated in (32), are plotted for \(\lambda := 2, \mu := 5, \nu := 2, \varrho := 0.3E^{-1},\) \(C:= 0.7E^{-2}, t:= 20, \omega _{0}:= 0.1, \omega _{1}:= 1, k_{1}:= 5\).