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Fig. 6. Effect of changing mesophyll conductance in the calculation of the apparent carboxylation (ϵ). The graph shows ϵ as a function of stomatal conductance in field‐grown, drought‐stressed grapevines, calculated directly from An–Ci curves (broken line) or after calculating Cc, from An–Cc curves (solid line). Data are from Flexas et al., 2002a).