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Relation between the distance from the apex and (a) the stele diameter, and (b) the cortex width for the different root types. Data show all experimental measures for the dedicated anatomical traits. The dark shadings show the 95% interval of confidence around the linear regression for each root type. (*): slope different than 0 (p < .05; generalized linear model: the anatomical layer width as a function of the distance, the root type and the combination of both)
