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Examples of the impedance spectra of the three experimental set-ups in the solution (filled symbols) and the best fit of the lumped model (open symbols) (see Figs 1, 2). (A) The stem with the whole root system in the solution (‘Stem and root’). (B) A single root in the solution (‘Root’). (C) The stem only in the solution (‘Stem’). In each curve, referring to different plants with different sizes of roots and stem, the frequency increases from right (60 Hz) to left (63 kHz).
