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Fig. 3. Effect of ozone exposure on shoot growth of cotton grown alone (0:1; open symbols) or averaged over all population ratios of nutsedge–cotton (All:1; closed symbols), expressed as (A) main stem length, (B) leaf area, and (C) number of leaves. Insets present the effects of nutsedge competition on the same measures of shoot growth at each level of ozone exposure (LO3, MO3, and HO3). Mean separation as in Fig. 1. ** indicates P $≤$ 0.01.