Shapes and sizes of charcoal in the Great Plains.

<p><b>A</b> Typical shape of a woody fuel type charcoal piece; <b>B</b> Typical shape of an herbaceous fuel type charcoal piece; <b>C</b> Boxplot of the range size of area of particles from the 51 surface sediment samples. The dashed line at 0.014 mm² corresponds to the area of a particle of 120x120μm. <b>D</b> Boxplots of the length and width of the charcoal particles. The dashed line is drawn at 120μm. <b>E</b> Linear regressions of charcoal count between (i) 60μm to 1 mm (x-axis) and between 120μm to 1mm (y-axis) (60–120μm); (ii) 60μm to 1mm (x-axis) and 180μm to 1mm (y-axis) (60–180μm); and (iii) 120μm to 1mm (y-axis) and 180μm to 1mm (x-axis) (120–180μm). The r-square and the p-values are indicated in the graph.