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PLR model describing the triphasic relationship between Ψpd and Ψmd for grapevine (corresponding to Fig. 5). The model is shown as a thick solid line. Roman numerals I to III designate the three phases of the WP curve. Vertically solid lines are the boundaries between phases I and II (Θ1) and phases II and III (Θ2), and corresponding se values are indicated in gray color. Model output parameters are summarized in Table 1.
