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The baseline-corrected 1600–1800 cm−1 region of the IR spectra of OA, either pure or in mixtures with alkanes or alcohols. This spectral region corresponds to the stretching vibration of the fatty acid carbonyl group. (A) OA ± C16-alcohol (2:1). (B) OA ± C16-alkane (2:1). (C) OA ± C14-alcohol (10:1). (D) OA ± C14-alkane (10:1). The spectrum of pure OA is drawn with a dashed line.
