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Figure 4: ATR-IR spectroscopy of raw-, NaOH-, and Enzyme-treated flax fibres: (a) peak at 1615 cm−1 that corresponds to pectin; (b), (c) peaks at 1735 cm−1 and 2923 cm−1, respectively, that correspond to hemicellulose; (d) peak at 1440 cm−1 that corresponds to lignin.