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SEM analysis of raw tucum fibers: (a) panoramic view of the cross-section of a tucum fiber from its end, magnification of 3600×; (b) longitudinal view of tucum fibers, magnification of 7000×; (c) EDS analysis of tucum fiber, the black curve represents the EDS spectrum of the surface in a region without phytoliths, while the red curve represents the spectrum from the region containing the phytolith.
