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Shrimp-shaped clusters of similar dynamical behaviour (orange, period 1; blue, period 2; white, higher periodic or divergent behaviour) in the (a,b) parameter space of the Hénon map, which is the prototype for all generic properties of nonlinear processes [18]. Two parabolas depict the ‘skeleton’ representing the lowest approximating nonlinearity of the generative nonlinear process [3,25]. K-means, but also the hierarchical Ward-type clustering, cannot properly deal with such shapes.
