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Voltage transfer to HEK293 cell on fibronectin at five stimulation frequencies. (a–e) Phase profiles of the negative relative experimental fluorescence modulation 
between the arrows in Fig. 5 c at 10, 25, 50, 83, and 125 kHz. The drawn lines are computed with a sheet resistance 
. The phase in the free membrane is marked by horizontal lines. (f) Experimental and computed phase versus frequency in the center of adhesion averaged over 9 μm.
