....

Remember, that in Zakharov-Sagdeev spectrum $n(q)\propto q^{-9/2}$, and in Kadomtsev-Petviashvili spectrum $n(q)\propto q^{-4}$. This assumption is true for the Zakharov-Sagdeev spectrum and is not true for Kadomtsev-Petviashvili one.

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