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. 2015 Sep 2;10(9):e0134448. doi: 10.1371/journal.pone.0134448

Fig 2. Summary of persistent biomarkers (hopanes and steranes) in oil and sediment.

Fig 2

First and second principal components (PCA 1 and PCA 2) from the correlation matrix of normalized persistent biomarkers in all oil and sediment samples collected in 2004 or 2005 (blue) and 2008 (green). Source oils were light and heavy intermediate fuel oil [IFO(L) and IFO(H), respectively]. Marine diesel oil (MDO) was also spilled by the S. Ayu. References are off-scale low (near PCA 1 = −21). The PCA 1 explained 51% of the variance and PCA 2 explained 19% of the variance.