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. Author manuscript; available in PMC: 2012 Oct 7.
Published in final edited form as: J Theor Biol. 2011 Jul 22;286(1):57–66. doi: 10.1016/j.jtbi.2011.06.038

Fig. 2.

Fig. 2

Nested tori; the minor circles (I1, θ1) represent different alveolar recirculation orbits and θ2 is the phase in the breathing cycle, whose period is T.