Boxplots showing distribution of z-statistics for each simulation configuration before (A,B,C) and after (A*,B*,C*) updating. The midline of each box marks the median. The bottom and top of the box represent the 25th and 75th percentiles, respectively; thus the height of the box is the interquartile range (IQR). Values that lie more that 1.5 IQRs beyond the top or bottom of the box (outliers) are shown individually. Lines project from the top and bottom of the box to the most extreme values not more than 1.5 IQRs beyond the box.