Dependence of T cell dynamics on the effector lifespan, τ. (a) Maximum T cell expansion level versus τ. The linear regression is fit to the first 9 points, i.e., τ = 1/3, 2/3, …, 3. The linear correlation rcorr = 0.9997. (b) The time of T cell peak versus τ. There is no saturating phenomenon, so the linear regression is fit to all 24 points. The linear correlation rcorr = 0.9995.