text: **Extended Data Fig. 4 | Relationship of mutation age and MAF. a**, Heatmap 
  showing the distribution of mutation ages for each minor allele frequency 
  (MAF) bin. To account for the uncertainty in when the mutation arose on a 
  branch, we sample a random date between the lower and upper ends of the 
  branch onto which it maps. We use 20 replicates of the simulation of Fig. 1b, 
  where sources split 500 generations ago and the admixture proportion is 0%. 
  **b**, Same as**a**but using mutation ages determined by Relate-inferred genealogies. 
  We place mutations at the same relative height between the lower and upper 
  ends of a branch as in the true trees to remove the uncertainty in when on the 
  branch the mutation occurred, so that we would recover the true allele age 
  from a correctly inferred genealogy.**c**, Pearson correlation between MAF, true 
  mutation age, and Relate mutation ages, as well as the same comparisons when 
  restricting to mutations of MAF less than 0.1. 