Typical wave profiles of resonant periodic solutions with |$E_b=1.5$|⁠, |$\Lambda=3$|⁠, |$\mathcal{R}=2$|⁠, |$\tau=0.4$| and |$A=0.05$|⁠. The value of |$\lambda$| is chosen such that the solution experiences second, third, fourth and fifth mode resonance respectively for graphs |$(a)$|–|$(d)$|⁠.