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Effects of Ra (horizontal axes) and Pm (vertical axes) on Kox (contours) for two sets of conditions: default values for all parameters, as given in Tables III and IV, including no blockage of apoplastic transport in the BS (A); and default values for all parameters, except that apoplastic pathways in the BS are blocked by a suberized layer or Casparian strip (B). Gray circles indicate the locations of default values for Ra and Pm (3 nm and 40 μm s−1, respectively).
