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. 2013 May 29;8(5):e65441. doi: 10.1371/journal.pone.0065441

Figure 1. Spatial Principal Component Analysis (sPCA) based on frequencies of Y-chromosome haplogroups.

Figure 1

The first two global components, sPC1 (a) and sPC2 (b), are depicted. Positive values are represented by black square; negative values are represented by white squares; the size of the square is proportional to the absolute value of sPC scores.