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Top. Three-dimensional phase portrait reconstructed from experimental time series of coIII concentrations. The embedding delay was 6 s.Bottom left. Poincaré section. Bottom right. Return map.Left. Poincaré section. The system is close to a "fat torus" bifurcation whereby the inner margins of the two loops of torus become entangled with each other and the stable manifold of the period-1 saddle cycle situated between them.