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I didn't know Finno-Ugrians populated the western part of Norway, I would think areas in mid Norway like Oppland would have more Finno-ugric contribution, In Heimskringla Snorri mentiones a Svåse Finnekonge(King of Finns) from Dovre in Oppland who's daughter Snøfrid Svåsesdotter, Harald Fairhair took as his wife.
On all Genetic tests western Norwegians cluster further west than eastern Norwegians, I doubt that would have been the case if the area was populated by Finno-Ugrian peoples, so the map seems a bit dubious to me, but I guess they could always have been pushed out by the encroaching Indo-Europeans.
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