Fig. 5: Contour plots, profiles, and eigenvalues of multiple solitons with \(n=4\).

Multiple gap solitons at different values of b: (a) b = −3.5; (b) b = −5.2; (c) b = −5.7. Subplots (d–f) and (g–i) are the corresponding profiles and eigenvalues of multiple gap solitons displayed in subplots (a–c).