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Effects of main treatments (+s.e.) where (A), (C) and (E) are the effects of site, water and temperature, respectively on stomatal density (number of stomata per 2·2-cm length of leaf; n = 314), and (B), (D) and (F) are the effects of site, water and temperature, respectively on leaf area (n = 304). Bars sharing the same letters are not significantly different (P > 0·10) using Tukey's test.
