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Abbreviations (n = carbon number, m = number of double bonds): internal standard (I.S.), ω-(alkylphenyl)-alkanoic acid (APAA, n:m), fatty acids (filled rhombi, n:m), 9,10-dihydroxyalkanoic acid (filled circle, n:m), n-alkanols (open triangles, n) and mid-chain ketones (filled squares, n). Synthetic contaminants are marked with an asterisk.
