Fig. 4

Double-periodic soliton (30) with different parameters of (The first row): Case (19) \(z=-2, t=2\), (The second row): Case (19) \(y=-2, t=2\) and (The third row): Case (19) \(x=-2, t=2\).
Double-periodic soliton (30) with different parameters of (The first row): Case (19) \(z=-2, t=2\), (The second row): Case (19) \(y=-2, t=2\) and (The third row): Case (19) \(x=-2, t=2\).