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Monitoring ΔT over time to narrow down the PWP. A, Seedlings R1 and R2 irreversibly passed the PWP (the dashed line shows the beginning of regular irrigation). B, Seedlings R3 and R4 recovered from drought treatment after irrigation (the dotted and dotted-dashed lines show the time of needle extraction and the beginning of regular irrigation, respectively). [See online article for color version of this figure.]
