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Season average diurnal gas exchange. Net assimilation and gs were monitored before, during, and after the conclusion of O3 fumigation in 2009 (black triangles) and 2010 (gray circles). Relative fold change values were calculated by comparing absolute values with the 10 am ambient measurement. The shaded region signifies the period when O3 was being fumigated. Error bars represent 95% confidence intervals.
