where v exp is the experimentally-measured plaque velocity with measurement error s v and v mod (t inf ,t L ) is the theoretical dependence of the plaque velocity determined by model simulation. Contours for the one and two-s values are drawn at F v~0 :6065 and 0:1353. A function on the parameter space, F lg , for the viral titer growth rate is constructed analogously. The product of these two functions is plotted in Figures 6C and 6F to show the likely regions of viral kinetics parameters controlling growth for each virus strain.