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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.