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The pattern of slow and fast oscillations in the presence of time-delays, described by Eqs. (16) and (17). Parameters are K = 0.02, γα = 10, γδ = 1, so that τ1 = 0.025 × 10/11, τ2 = 0.025 × 10/9, τ3 = 0.075 × 10/11, τ4 = 0.075 × 10/9. (A) τ = 0.005 ∈ (τ0, τ1), α1 − α2 = δ1 − δ2 = 0; (B) τ = 0.025 ∈ (τ1, τ2), α1 − α2 = δ1 − δ2 = π/2; (C) τ = 0.05 ∈ (τ2, τ3), α1 − α2 = 0, δ1 − δ2 = π; (D) τ = 0.075 ∈ (τ3, τ4), α1 − α2 = − π/2, δ1 − δ2 = π/2.
