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Chemical signal oscillations in the delayed-feedback model given by Eq. 1 for various values of the delay (in units of 100 s): τ = 0.2 (a); τ = 0.29 (b); τ = 0.75 (c); and τ = 1.5 (d). Other parameter values are n = 4, I0 = 6, WE = WI = 5.5 such that τc ≈ 0.25.
