Fig. 3

Box-plots for the percentage variation between the replicas for each variable: ‘yield’ (a), ‘A₂₆₀/A₂₈₀’ (b), ‘A₂₆₀/A₂₃₀’ (c), and ‘RIN’ (d), with the three methodologies, as tested by both technicians. Box-plots of the data are represented. The box with the horizontal black line shows the first and third quartiles and the median. The whiskers show 1.5 times the interquartile range. The points show outliers. The “+” sign represents the average for each variable