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by Wilya 4798 days ago
It means that the faces can be described using only six uncorrelated parameters. Or to put it another way, there are only six axis of variations. Each face is a combination of the six eigenfaces, but there is still an infinity of different ways to combine these faces, and so an infinity of possible faces.

(Without a comparison to the general population, it's not obvious that 6 is a small number here, so take my "only" 6 cautiously)