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(Color online) (a) Two skew tent maps for a = 0.3 (thick solid line) and a = 0.7 (thin solid line), respectively. (b) Transversal Lyapunov exponent λ⊥ (dash-dotted line) and two synchronization indices γ (thick solid line for a = 0.3 and thin solid line for a = 0.7). Two γ values are almost the same. Transversal Lyapunov exponent λ⊥ decreases as ε increases and crosses 0, when γ approaches 1.
