Figure S16. 13C-1H HSQC NMR spectrum of oleic acid 210°C, 3h, air showing single-bond C-H correlations (CH2 are red positive, CH and CH3 are blue negative), e.g. 13C signal at 64 ppm is due to a methylene carbon (attached to oxygen) with its hydrogens giving 1H signal at 4.0 ppm.