could you share those coordinates? Swedes probably have both Finnish and Baltic influence, north east Germans should have only Balto-Slavic
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I think those interested in this subject will naturally be familiar with the proper German nomenclature. If anything, the English might be unfamiliar to them, since English speakers generally don't know much or talk much about Brunswick and Upper Saxony and Hither Pomerania.
Even if regions like Lower and Upper Austria have a vast diversity, you should still do an average based on the geographic/political division, I think. For example Alföld is super diverse, from the northern areas being more similar to North Hungarian results while southern parts are kinda Slovenian-like, even more southern, but I still decided to have them all under this geographic term. Many outliers are natural to be in any region.
Since you respect Dodecad K12b, you could make a few generalized German averages. We already have three (Bavarian by Piotr, some Eastern-ish academic dataset and Creoda's Northwestern). I guess an improvement would be good, especially if you really have a lot of data.
I have done a clean-up to the previous Vahaduo sheet and renamed a few things. Southeast became Subcarpathia, like the name of the voivodeship, I moved Lemko under their own category since they are a separate ethnic group from Poles, I deleted Kielce since it is part of Lesser Poland and very similar to them, and also deleted North Wielkopolska since it is part of Greater Poland and very similar to it.