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Gas chromatogram of hydrothermally treated GRA-IOM water and solvent extracts. Mass-spectrometric detection, combined to scale: 1-naphthalene, 2-pentadecane, 3-heptadecane, 4-phenanthrene. (Inset) Expanded view of the chromatographic elution of C2–C5 branched benzenes (C2 black, C3 gray, C4 yellow, and C5 green).
