Figure 2 . Example of cooling curves for bald (red; hairs removed) and hairy (blue; hairs intact) patches adjacent to one another on the same OLEU leaf. Symbols = temperatures measured by infrared thermography; lines = model of leaf thermal dynamics fitted to the data. In this example, the time constants for cooling (τ ) calculated from the fitted models were 9.79 and 10.94 seconds for the bald and hairy patches, respectively. Note: the symbols are plotted with a very small size so as not to obscure the close match between the fitted model and the data.