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We use the weight $\delta$I, deduced from the estimation of Lyapunov vectors,in order to characterise regions in the kinetic (x, v) space with particlesthat most contribute to chaoticity. For the paradigmatic model, the cosineHamiltonian mean field model, we show that this diagnostic highlights thevicinity of the separatrix, even when the latter hardly exists.

Contribution of individual degrees of freedom to Lyapunov vectors in many-body systems