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. Author manuscript; available in PMC: 2013 Jan 21.
Published in final edited form as: J Theor Biol. 2011 Oct 19;293:87–100. doi: 10.1016/j.jtbi.2011.10.010

Figure 1.

Figure 1

Illustration of commuting and subdivision of population. At any time each subpopulation is occupied by its own residents plus visitors from its neighbors. For instance, the population in subpopulation i is divided between individuals who reside and are present in the subpopulation (Nii) and those who are residents in subpopulation j but present in subpopulation i(Nji). Different classes of people move between connected subpopulations along the edges at the rates shown.