Figure A1.

Phase diagram for a fixed population size of the single- to multiple lineage transition, as a function of mutation rate $\mu$ and mutation jump size $\sigma$. The figure is similar to the one presented in the main text in Figure 4 but assuming a fixed fraction of infected hosts ${\overline{f}}_i=8\times {10}^{-4}$, ${10}^{-3}$, and $1.5\times {10}^{-3}$ (from left to right, panels i to iii). (A) average number of lineages, (B) fraction of time where viruses are organized in a single lineage, (C) rate of lineage splitting, and (D) the average coalescence time.