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Fig. A.1
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Distortion scores for clustering applied in the 3.2–3.6, 5.95–6.6, 7.25–8.95, and 10.9–11.63 μm region plotted as a function of the number of clusters used. The inflection point, or ‘elbow’, in the distortion curve is highlighted with the dashed black line. As is shown, four clusters are optimal for each wavelength regime.
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