text: **Extended Data Fig. 9 | Ancestry models of Viking Age individuals in**
  **Scandinavia. a**, MDS of each Scandinavian Viking group plotted on top of 
  preceding Iron age and Roman individuals.**b**, All accepted qpAdm models using 
  Twigstats-1000 for every Scandinavian Viking individual in Denmark, Sweden, 
  and Norway, computed in a rotational qpAdm with source groups identical to 
  Fig. 4. We only retain models with feasible admixture proportions, standard 
  errors of <0.25, and show models with 1 source and a p-value greater than 0.01 
  or otherwise with 2 sources and a p-value greater than 0.01. If several models 
  satisfy p > 0.05, we show all such models, otherwise we select the model with 
  the largest p-value. The -log10 p-values are shown to the left of each model. 
  We combine models involving related sources, if they exist, by averaging their 
  respective admixture proportions, standard errors, and p-values. We plot one 
  standard error. 