Fig 10. Four types of nonlinear spectra and their Benjamin-Feir index.
(a) Scatter plot of rogue-wave samples of one-dimensional Benjamin-Feir index BFI1D over maximum wave height Hmax based on the four types of spectra. (b) Scatter plot of non-rogue wave samples of two-dimensional Benjamin-Feir index BFI2D over maximum wave height Hmax based on the four types of spectra. (c) Scatter plot of rogue-wave samples of one-dimensional Benjamin-Feir index BFI1D over maximum wave height Hmax based on the four types of spectra. (d) Scatter plot of non-rogue wave samples of two-dimensional Benjamin-Feir index BFI2D over maximum wave height Hmax based on the four types of spectra.