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Comparison between Px and Pb measured in the same leaf (Fig. 1). Each symbol represents measurements of Px and Pb for a different leaf (total: 65 leaves measurement on 65 plants). □, Leaf tip was covered with aluminum foil to prevent transpiration (slope = −0.984); ○, uncovered leaf that was allowed to transpire (slope = −0.967). The results indicate that the pressure probe and the Scholander-Hammel bomb measure similar values.
