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Figure 2
Comparison of the interfacial spectral component for different data analysis methods. PCA (blue) is shown for comparison. NMF without background subtraction (orange), NMF implemented in SciPy by removing negative data points (green) and the new modified NMF (purple) methods are compared with the region closest to the defect in Fig. 1[link] (red). Dashed lines represent the zero point for each spectrum (note the offset between the orange trace and its dashed line as the background is not subtracted). The modified NMF trace most closely resembles the actual spectrum of the region closest to the defect.

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