Comparison of Earbox (y) and reference (x) data. A Ear length in centimeters. B Maximum ear diameter in centimeters. C Length of the fertile zone in centimeters. D Number of grains per cohort in the median third of the ear. E Average number of cohorts per ear, the mean of 4 observations around the ear (x), the average of the maximum number of cohorts per ear of 6 images of the ear (y). Graphs A–E include all 791 ears from both panels. F Number of grains per ear measured automatically by the Earbox (y) and manually with an automatic grains counter (x) for 257 ears selected from the environmental diversity panel. G Grain width in centimeters, measured along the axis perpendicular to the ear. H Grain height in centimeters, measured along the main axis of the ear. I Assignment of a cohort number to each grain. Data presented in G–I correspond to a set of 809 grains measured and classified automatically by the Earbox (y) and measured manually on the acquisition images (x) for comparison. Green dots: ears from the biological diversity panel; red dots: ears from the environmental diversity panel. Empty red dots: scattered ears of the environmental diversity panel (Fig. 3B). Grey dots: grain dimensions (one dot = one grain). Grey line: bisector line. Black line: linear regression of the data. R²: correlation coefficient between x and y values, RMSE: root mean square error, n: number of observations in each graph.