Majority of Baltic pheno can be found around baltic states who are not slavic.
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My father's aunt (but not related to him by blood - she married into the family) was an autochthonous Pole from Kalsko (Kalzig):
https://en.wikipedia.org/wiki/Kalsko
This is almost at the westernmost end of the ethnic Polish area according to 1910 census, I wonder what her results would be:
Green = Polish majority
Orange = German majority
Kalzig (Kalsko) was mixed, slightly >50% German but with very numerous Poles (according to 1910 census):
https://i.imgur.com/6Xly5Cv.png
Then we have cases like Kramkowski from East Prussia who discovered he is Polish:
(and AFAIK he has recently returned to live in his native Olsztyn/Allenstein, Poland)
Spoiler!
^^^
His Eurogenes K13:
Admix Results (sorted):
# Population Percent
1 Baltic 40.18
2 North_Atlantic 32.23
3 West_Med 13.81
4 East_Med 6.33
5 West_Asian 3.2
6 Red_Sea 1.48
7 Siberian 1.41
8 Oceanian 0.77
9 Northeast_African 0.6
Single Population Sharing:
# Population (source) Distance
1 South_Polish 4.7
2 Ukrainian_Lviv 6.13
3 Ukrainian 6.15
4 Polish 6.78
5 Croatian 7.71
6 East_German 9.03
(...)
Many "Germans" don't know they are Polish or part Polish until they do a DNA test.
One the one side I agree with your post, but there are extraordinary cases in each ethnicity. Even here on forum there are atypical looking members for their ethnicity ending with typical genetic results. Looks can be deceptive, if you wanna be sure about your ancestry, DNA test is one of the best solutions
Another example similar to Kramkowski, is Teutonski from our forum.
I don't think it is "central". The whole region is located in the western half of Poland.
There is Lubusz Voivodeship to the west, but this region is "thin" from west-to-east:
https://en.wikipedia.org/wiki/Lubusz_Voivodeship
Central Poland is rather Lodz Voivodeship:
https://en.wikipedia.org/wiki/%C5%81...BA_Voivodeship
If you add "East" before Germans and replace Polish with Slavic, I kind of agree with you. There are not so many Slavic influenced people in Western Germany (I suspect even the Poles that came to Ruhrgebiet are today Germanic-admixed). Most people in Western Germany have nothing to with Slavs though.
I would say Poles