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Host's ES rate of activation μ plotted against (a) recovery rates 
and 
and (b) susceptibility to infection β. In both cases, the pathogen was nonplastic 
. (a) The white dashed line indicates 
. (b) Thin lines with numbered labels are 
isoclines. Parameter values as in Fig. 2, except (a) β = 0.2, (b) 
= 0 and 
= 1.
