Effective potential for a non-degenerate NK landscape with \(N=8\) and \(K=6\). The FWA approximation familiar from Anderson localization theory gives excellent results, including at large mutation rates (left). By contrast, the bare fitness values \(\phi\) are poorly correlated with the effective potential \(U\) (right). Here mutation rates are given in units such that \(\phi\) ranges from\(-1\) to \(0\). -