Figure 7.

Adaptation rate R as a function of population size N for $u_d=5\times {10}^{-3},u_b={10}^{-12}$ and $s_d=5\times {10}^{-4}$ (points) for various ${\overline{s}}_b$. The lines show the result obtained using (18) for $s_d\to 0$. The population size above which clonal interference operates is found to be $3.2\hspace{0.17em}\times \hspace{0.17em}{10}^{10},6.9\hspace{0.17em}\times \hspace{0.17em}{10}^{10},1.1\hspace{0.17em}\times \hspace{0.17em}{10}^{11}$ for ${\overline{s}}_b/u_d=4,\hspace{0.17em}1,\hspace{0.17em}0.7$, respectively.