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Structural filtering of the PCA components of a Raman spectroscopic image. The upper row shows the components in the usual rank order according to their explained variances. The lower panels are reordered with respect to the anisotropic structural information content. Most prominently, components 1–5 remained in their original order, while components 6–8 were rejected due to the high proportion of artificial structural elements (i.e., systematic errors).
