Figure F54. Mass chromatograms of the ions m/z 85, 215, and 217 for n-alkanes, sterenes and 5-β cholane standard. Comparison of full procedural blanks for the AF1 fraction (see Fig. F22 in the “Methods” chapter [Expedition 337 Scientists, 2013b]), Site C0020. No hydrocarbon biomarkers were detected in the procedural blank and there is little evidence of peaks that could interfere with biomarker measurement. is = standard.
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