Figure S 13: Plot of echo intensity I (y axis) versus the gradient area squared (γGzδ)2(∆-δ/3) in ns/m2 (x axis) in 2-component fits for the 2.0 ppm methylene signal (above) and 5.2 ppm olefin signal (below) of thermally treated (210°C, 3h, air) oleic acid collected with Δ = 90 ms, δ = 40 ms, G = 5-25k G/cm/DAC in 15 steps.