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. 2014 Aug 12;4:6039. doi: 10.1038/srep06039

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(a) Lyapunov exponents as a function of control parameter α_C. We used the following FET1 parameters, dimension = 7, delay = 10, evolve = 1, Scale_min = 10⁻⁵, and Scale_max = 0.7. The Lyapunov exponent λ ≤ 0 indicates no chaos. The dotted line shows λ = 0 (b) Analysis of properties of random numbers based on the improved FIPS test. (c) Schematic of cases that pass the improved FIPS test. For all 35 cases that pass the improved FIPS test, the corresponding Lyapunov exponent is positive [see panel (a)].