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It seems there's a variation in two directions: Slovenia and Austrian Tyrol/France/SW Germany. The results from Pordenone I have seen show a heavy tendency towards the main French cluster, like the Trento 'S' sample. They all derive their ancestry from the same city and I'm not sure if this city is inhabited mainly by ethnic minorities or not, someone living in Italy could help us with that.
I guess we will only have a more accurate picture of Northeastern Italy with much more samples. I have seen people from Trento plotting only slightly more northern than lowland Venetians and others who plot almost like Austrian Tyroleans. Individual variation seems to be strong in the region, more than in other parts of Europe I've seen so far.
I'm searching for Swiss Romansch and Ladin results from Trentino, do you have any? I think they can be a 'key' to solve this mystery since they are probably the closest populations to what Alpine populations were before Italics, Germans, Slavs. Maybe some Friulans as well, given the fact Friulan is a Rhaeto-Romance language.
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