The annual trend, from 1986 to 2006, of various verification metrics for forecasts of 10.7 cm solar flux with lead times of one to three days. The top panel plots the mean of the observed value during the year, the second panel plots the mean error (or bias) of the forecasts, the third panel shows the root mean square error of the forecasts, and the bottom panel displays the linear association (correlation) between the forecasts and observations.

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