Overview of the dispersion of the results of morpho-anatomic characterization of individual achenes. Loc: trial sites, CV: cultivar, A1: surface of achenes, A3: surface of the embryos, PrThick: thickness of pericarps, RoF: rate of filling, RoC: rate of contacts. The nine cells in the upper left panel give the number of observations for each combination of years (2021 and 2022), locations (Azay and Cham), and cultivar (V01, V04, V26, and V27). The upper right panel shows boxplots for each level of the variable considered. The lower left panel displays frequency histograms of the continuous variables for each level of the fixed factors, and the lower right panel shows pairwise scatterplots and correlation coefficients with significance codes: *** for P < 0.001, ** for P < 0.01, and * for P < 0.05. The diagonal of the correlation matrix shows the distribution curve of the data for each continuous variable.