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Example of NMF applied to SIMS data. Original caption: NMF results with three components for the fingerprint dataset. Field of view: 1 cm × 1 cm. Source: Trindade et al. (2017), Figure 4. Reproduced with permission of Elsevier. NMF, nonnegative matrix factorization; SIMS, secondary ion mass spectrometry. [Color figure can be viewed at wileyonlinelibrary.com]
