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Fig. 5. First-order decline in total target polycyclic aromatic hydrocarbons (PAHs) (i.e., two- to six-ring PAHs and C1 to C4 alkyl homologs of two- and three-ring PAHs). Error bars represent ±1 standard deviation unit. C, control samples; Os, Osmocote-treated samples. C/C_H, hopane-normalized concentration of total n-alkanes.