Beakers vs modern-day Northern Europeans

Here are most of the Beakers from Olalde et al. 2018 in my Principal Component Analysis (PCA) of modern-day Northern European genetic variation. They look rather Celtic or perhaps Celto-Germanic, don't they? The relevant datasheet is available here.



If you're wondering why the Yamnaya and early Baltic Corded Ware individuals are sitting in the middle of the plot, I'd say it's because they