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During the complex shape forming of composite fibrous reinforcement, the in-plane bending of roving tows results in an out-of-plane deflection, along with a rotation on its central axis. The need to accurately follow and quantify the formation mechanism of such defect has led us to consider two 3D imaging techniques which were tested and compared in this work. Solutions to prevent the appearance of this defect were proposed with success. [ABSTRACT FROM AUTHOR]

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