Notched boxplots shown in main figures 3–7 and supplement figures S1, S3–S5: box represent interquantile range (IQR) 50 percent of data, notch is 95% confidence interval of the median, horizontal line inside box is median, upper whisker is lesser of 75 percentile or maximum value, lower whisker is greater of 25 percentile or minimum value, dots show outliers. According to Graphical Methods for Data Analysis (Chambers, 1983) although not a formal test the, if two boxes’ notches do not overlap there is ‘strong evidence’ (95% confidence) their medians differ. Package “ggplot2” (https://cran.r-project.org/web/packages/ggplot2/ggplot2.pdf) was used to plot notched boxplots (Wickham, 2009)
