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Figure 3
Comparison of the two component spectra obtained by modified non-negative matrix factorization (interfacial in blue and bulk in green) with reference spectra from Conradson et al. (2013BB12) (U3O7 in orange and UO2 in red). Spectra are offset for clarity. The isosbestic points at 531.5, 535.3 and 536.9 eV as determined by k-means cluster analysis are shown as dotted lines.

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