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THE FIRST component is almost superimposable to the archaeological dates of the spread of farming from the Middle East between 10,000 and 6,000 years ago.
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THE SECOND principal component parallels a probable spread of Uralic people and/or languages to the northeast of Europe [c. 4,000 years ago].
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THE THIRD is very similar to the spread of pastoral nomads (and their successors) who domesticated the horse in the steppe towards the end of the farming expansion, and are believed by some archaeologists and linguists to have spread most Indo-European languages to Europe.
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THE FOURTH is strongly reminiscent of Greek colonization in the first millennium B.C.
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THE FIFTH corresponds to the progressive retreat of the boundary of the Basque language. Basques have retained, in addition to their language, believed to be descended from an original language spoken in Europe, some of their original genetic characteristics.
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