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Figure 2 (a) flax-epoxy specimen. (b) Plane modelling of water diffusion in the flax- epoxy specimen using an elliptical description of the twill flax fabrics undulation. (c) Plane modelling of water diffusion in the flax-epoxy specimen using a [0/90] description. (d) Elliptical modelling of the cross-section of the warp strand.