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. Author manuscript; available in PMC: 2017 Oct 24.

Published in final edited form as: J Coupled Syst Multiscale Dyn. 2015 Sep;3(3):233–243. doi: 10.1166/jcsmd.2015.1082

Fig. 2 — Schematic illustration of the four-stage model given by extending Eq. (1), where $Λ = β_{1} I_{1}^{N} + β_{2} I_{2}^{N} + β_{3} I_{3}^{N} + β_{4} I_{4}^{N} + (1 - η) (β_{1} I_{1}^{B} + β_{2} I_{2}^{B} + β_{3} I_{3}^{B} + β_{4} I_{4}^{B})$ and the superscripts B and N represent individuals that changed their behavior and individuals that did not change their behavior, respectively.