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Fig. 5. Box plots of RMSR values for different neural network models predicting (a) water retention, and (b) unsaturated hydraulic conductivity. The box plots summarize the distribution of root mean squares of residuals (RMSR). The horizontal line in each box signifies the median value, whereas top and bottom of the box represent the 25th and 75th quantiles. The whiskers extend from the ends of the box to the outermost data point that falls within the distances of upper quartile + 1.5 (interquartile range), and lower quartile – 1.5 (interquartile range), respectively. 
, water content; K, hydraulic conductivity.
