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. 2016 Mar 15;6:22257. doi: 10.1038/srep22257

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Fourier power-spectra: (a) in the frequency domain ν for the signal S(x₀, t), (b) in the kL_x domain, where k = 2π/λ is the wavenumber, for the signal S(x, t₀) (red squares indicate the spectrum in a bigger system L_x = 180, L_y = 5 and L_z = 150). The arrows highlight the position of the peaks. In both panels the first and second harmonics are present. The two insets show typical signals in real space. Panel (c) shows the characteristic frequency of the waves, which are found to be monotonically increasing functions of Wi.