Fig. 4. The top figure shows modeled waveforms for permittivities of 1 and 50. The equivalent probe is shown below and then three graphs showing start points for sensors with 40, 50, and 60 ohm impedance heads, 3 cm long; the solid lines represent the calculated start and end of the sensor head. The 40-ohm head creates a dip in the waveform, the 50-ohm head is matched and the 60-ohm head creates a bump.

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