Figure A2.

Dependency of ${\overline{f}}_{\text{out}}$ on f_in for different models. (A) Original HHS model (t₀ = 1 ms). Notice that ${\overline{f}}_{\text{out}}\approx f_c^1-a\left(f_{\text{in}}-f_c^1\right)$ with a > 0 for $f_{\text{in}}\approx f_c^1$ (intermittent mode). (B) HHSAP. (C) HHSIP.