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Figure 3
(a) The two main components of a non-negative matrix factorization from a single ROI computed from a scan of the O K-edge. Component 1 is the major component and corresponds to the many pixels that record scattering from the Be gasket. Component 2 corresponds to pixels that record scattering from the SiO2 sample. (b) Covariance of the spectrum of each respective pixel and the spectrum of component 2 from part (a). In a first iteration, we chose a threshold represented by the horizontal black line. (c) Image representation of the ROI used to initiate the NNMF (inset top), the resulting ROI after the thresholding shown in (b), the single pixel ROI after two iterations of the NNMF procedure, and the corresponding detector image (inset bottom) used in the NNMF demonstration in part (b) and (c).

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 24| Part 1| January 2017| Pages 269-275
https://doi.org/10.1107/S1600577516017100
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