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Figure 1.  Bifurcation diagram and Lyapunov exponents for frequency f ∈ [0.01, 0.30] at I_m = 1, η = 0.98, and ρ = 0.99.

Figure 2.  Bifurcation diagram and Lyapunov exponents for amplitude I_m ∈ [1, 2] at f = 0.16, η = 0.98, and ρ = 0.99.

Figure 3.  Bifurcation diagram for fractional-order η ∈ [0.95, 1] vs. membrane potential x at f = 0.16, I_m = 1, and ρ = 0.99.

Figure 4.  Dynamics of the system for f = 0.01 and I_m = 1 at fractional order η = 0.98 and parameter ρ = 0.99.

Figure 5.  Dynamics of the system for f = 0.01 and I_m = 2 at fractional order η = 0.98 and parameter ρ = 0.99.

Figure 6.  Dynamics of the system for f = 0.171 and I_m = 1 at fractional order η = 0.98 and parameter ρ = 0.99.

Figure 7.  Dynamics of the system for f = 0.23 and I_m = 1.6 at fractional order η = 0.98 and parameter ρ = 0.99.

Figure 8.  Dynamics of the system for f = 0.01, I_m = 2, and ρ = 0.99 at two different fractional order values.

Figure 9.  Dynamics of the system for f = 0.23, I_m = 1.6, and ρ = 0.99 at two different fractional order values.