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Energy of each group average 2D slice of the estimated second-order Volterra kernels from Refs. 17 and 18 and third-order kernels, normalized by the diagonal slice energy, in descending order of value for WKY, SHR120, and SHR160. The second-order kernel was always diagonal, whereas the third-order kernel was virtually diagonal for SHR120 and approximately diagonal for WKY and SHR160.
