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Figure 1. The bimodal relationship between stomatal conductance and leaf water potential in Kentucky bluegrass leaves (open circles and squares). The mode of rapid change of stomatal conductance as a function of water potential is shown as open circles and fitted with a solid line; the mode of slow change is shown as open squares and fitted with dotted lines. The water potential values for the junctions (solid arrows) fall within the 95% limits of the initial turgor loss point. Like data of western wheatgrass (solid circles) was fitted with single linear regressions (dashed lines) and the water potential values for the hypothetical junction points (dashed arrows) also match the corresponding turgor loss point for western wheatgrass. Each data point represents the averaged measurements on 3-12 leaves and the error bars are for standard errors.