Using the same standardized data we have the following PCA plot, which differs from what we see on plots made using only partly overlapping SNP sets. I don't see any reason to use Mediterranean samples, because of the small SNP number of some samples. What we see in general on the plot is that most ancient samples fall between Germans and Poles. We see also that Finns, Russians, Poles and Norwegians show genetic drift. The most Polish ancient sample is WEZ56 and WEZ54 falls inside the British cluster. Samples WEZ39, WEZ40 and WEZ51 fall somewhat closer Finns, being still Central European. WEZ56 is the most Polish sample in the original study graphics too.