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Subsampling and data organization (pictures not in scale). Code explanation: ‘P25’ primary MP in the size range of 2–5 mm, ‘S25’ secondary MP in the size range of 2–5 mm, and ‘S12’ secondary MP in the size range of 1–2 mm. Small samples are referred to as P25small, S25small, S12small according to size. Only one throw was performed for fibers batches.
