Figure 3.

Change in the mutator frequency when compensatory mutations are included, $\mathit{\delta }p(k)=p(k)-p_0(k)$ for $U_b={10}^{-4}$. The points (○,□) are obtained by numerically iterating (A1) and (+,×) show the perturbation theory result (A7), and we observe a good agreement. The simple expression (10) for large $U_d/s$ is also shown (lines).