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Fig. 4. Using weighted means of cells in sclerenchyma fibre bundles, fibre cell area was 76 µm2 and fibre protoplast area was 47 µm2 at 45 mm distal to the ligule (A) while fibre cell area was 89 µm2 and protoplast area was 50 µm2 at 75 mm distal to the ligule (B). Increase in cell wall thickness occurred primarily by increase in the outer diameter of fibre cells rather than by a decrease in diameter of fibre protoplasts.