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Anatomical variables: number of cells (nCells), number of earlywood tracheids (nEw), number of latewood tracheids (nLw), number of earlywood-like tracheids within the latewood (nIADFs), cell wall thickness of the earlywood (EwCWT) and lumen diameter of latewood (LwLD). Data are the means ± 2SE and different letters indicate significant differences between years.
