Fig. 5

The area burnt annually in the Angolan catchments of the Cuito, Cubango, Cuando, and upper Zambezi Rivers, and for three dominant vegetation types. Box and whisker diagrams indicate the median and 25th and 75th percentiles respectively; open circles show outliers. Significant differences between months revealed by Wilcoxon post hoc rank sum test are denoted by letters A–F. Note that scales differ for the vertical axis