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Figure 4a - This is an example probability distribution graph showing one year of invented daily temperature. The x or horizontal axis shows temperature in °C from (8 to 22) °C in steps of 2 °C. The y or vertical axis shows density, from 0.00 to 0.25 in steps of 0.05. The graph is a smooth, bell shaped curve, with a peak in the range (14–15) °C

Figure 4b - This is an example probability distribution graph showing one year of invented daily rainfall. The x or horizontal axis shows rainfall in mm day-1 from (0 to 4) mm day-1. The y or vertical axis shows frequency in days, from 0 to 3.5. The graph is a smooth curve, decreasing exponentially from a maximum where rainfall = 0 mm day-1 to zero at 4 mm day-1.