So here's my suspicion of what the trace regions on Ancestry mean: According to Ancestry, my primary regions are Great Britain, Ireland, and Scandinavia. On Gedmatch, the British and Irish populations in particular tend to have about 7+% Iberian DNA. Also on Gedmatch, my Iberian is shown to be between 11-12%. On Ancestry, it's given as 3%. My suspicion is that my 3% trace amount of Iberian on Ancestry means that I have about 3% Iberian above the average for the British Isles populations I could be totally wrong.
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