Total vertically integrated vertical kinetic energies as a function of mode frequencies, Re(ω), which correspond to solutions of Eq. (8) with H = 5 and k = 2. is shown, normalized to the corresponding vertically integrated energy of the fundamental corrugation mode, i.e. . The relative weakness in the power of the surface modes located in the frequency windows 1.2 and 1.3. The labeled modes displayed in Fig. 2 are also labeled here.