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Well we know from archaeology that there were post-Beaker movements into Iberia from beyond the Pyrenees from peoples with a clear CEU origin, even before peoples from a Hallstatt archaeological context came into play, what we don't know is what impact any of these groups had.
Besides if I'm not mistaken the Beaker_Iberia samples are lacking in steppe admixture when comparing to modern ones, so naturally they need another additional source, especially when you're (correctly) including populations which have considerably less of this type of ancestry into the model - although I'd use the Collegno outliers instead of South Italians. This doesn't mean that the 17% - or whatever - of Germanic_Collegno is uniquely form a post-roman source, so the figure will naturally be considerably lower than that
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