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Final internode diameter differences between plant densities [PD4.5 (red dashed line), PD6 (blue dashed line), PD7.5, (green dashed line), PD9 (black dashed line) and PD15 m−2 (pink dashed line)] and cultivars (C1 Zhengdan 958, C2 Longping 206, and C3 Jinqiu 119). Vertical bars indicate standard errors.
