Distribution of the relative error between simulated and national statistical
rice yield (averaged over 1981–2000) resulted from different calibrated parameters.
The upper and lower hinge of the box indicates the 75th percentile and 25th
percentile of the data set, respectively. The upper and lower error bars indicate the
95th and 5th percentile, respectively. The black line in the box indicates the median
value, and the red line indicates the mean value of the data set. R2 is the coefficient
of determination between simulated and statistical national yields across the
countries.