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Figure 3. Correlations between specific leaf area (SLA) and leaf dry matter density and between  SLA and leaf thickness in Kentucky bluegrass growing in heavily grazed pastures (a,b) and in ungrazed exclosures (c,d). Each data point represents the measurement made on a composite sample of 12-20 leaves. Shown in the figures are sample size (n), the Pearson correlation coefficients (r), and associated probabilities (p).