I don't understand how analysis of DNA ever got away from this. Unless you are comparing ancient samples or archaic human samples to different modern populations than G25 and qpAdm/admixtools are overkill IMHO. I personally don't care about breaking down Ancestry into many different parts with 4 oracles or nMonte etc... I dunno, maybe AncestryDNA and 23andme don't do this single GPS stuff because most Americans are mutts or maybe their agenda is not have Americans think about their European origins in favor of assimilation into the American melting pot.

Anyway, if you feel like investing the energy (which I happen to think is worth it.) Map your ancestry with these two tools and see if they are similar to each other to within 500 kilometers. In you need more accuracy than 500 kilometers then you are autistic IMHO. I'm not sure how well Tolan's utility works for Greeks etc... but anyway it can't hurt to try it. I think these two have been posted before, individually, in the past but I don't think ever together in comparison to each other's results.

The two methods (the first one accurate to within 500 kms and the second to 400 kms) :

http://genetics.cs.ucla.edu/spa/23andme.html

https://gen3553.pagesperso-orange.fr/ADN/Europe.htm

You can convert other raw data formats into 23andme format, if need be, with the tool below :

https://dnagenics.com/dna-kit-studio/


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My results both in England :