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Seems like convincing correlation with Elbe river.
In North Germany, 28% R1a east of Elbe and 14% R1a West of Elbe. Then R1a is at 10%< significantly west of Elbe.
Genome-wide DNA could get a good idea how much Slavic vs West Euro (Franco-Germanic) ancestry exists in different parts of Germany and Poland. It would be needed to confirm Slavs east of Elbe were assimilated by Germany.
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