Genealogical tree and skyline plots of coalescent statistics for 624 China and Southeast Asia samples of HA sequences of influenza A (H3N2). The tree shown represents the maximum posterior tree sampled over the course of the MCMC analysis. Vaccine strains are shown on the tree as colored points and included regardless of geographic origin. For coalescent statistics, TMRCA, diversity and N
τ, solid lines represent mean values and gray outlines represent 95% credible intervals across MCMC replicates. TMRCA, diversity and N
τ are measured in units of years.