Scenario A: Comparing emissions of nitrous oxide from different countries. The estimated emissions of N20 from agriculture in 2010 presented with (a) histograms, with the means shown by the solid black lines and the 95% confidence interval shown by the solid grey lines, (b) shaded arrays, where the intensity of colour indicates the density of the underlying PDF, and (c) boxplots, where the green lines show the median values, the black boxes depicting the lower and upper quartiles and the dotted lines show the extent of the 95% confidence intervals. (For interpretation of the references to colour in this figure legend, the reader is referred to the web version of this article.).