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. 2015 Jul 23;5:12408. doi: 10.1038/srep12408

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(a) nine variables, PC1 versus PC2; (b) nine variables, PC3 versus PC4; (c) four variables, PC1 versus PC2; and (d) four variables, PC1 versus PC3 (NB: 95% concentration ellipsis for RMH shown; convex hull for EMH indicated; Key: 1 = LL1, 2 = UC101, 3 = UC103, 4 = LJNG, 5 = HCC, 6 = KEL, 7 = CM1, 8 = PRD3, 9 = PRD4, 10 = OASE 2, 11 = HTO, 12 = SD1, 13 = SD5, 14 = DALI, 15 = SH5, 16 = PETRA & 17 = SANG17; see main text and Table S1 for key to abbreviations).