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a) DC measurements, voltage sweeping range is −100–100 mV b) AC-measurements, Nyquist plot, frequency range is 1 Hz-2 MHz. Relative humidity (see legend) was controlled by humidistats (see Materials and Methods). It should be denoted that after reaching critical humidity level (≈90%) the impedance changes its shape radically (purple line), semicircles become indistinguishable.
