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this is an "interpolation map"
each of those black dots represent a dna study, and the purple areas and the percentages are predicted by an algorithm based on those few studies.
as you can see there are no dots in Albania and Macedonia so that's just the algorithms guessing.
also you can see for Croatia the percentage for the whole country is predicted based just on the Serb-populated areas.
In actual studies on Croats it was found only in the West (Rijeka region) with 1-2%, and virtually absent in the rest of the country.
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