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Fig. 6. Permittivity estimated from calibration of probe adjusting the electrical length of the probe according to measurements in water using the bump apex as a timing reference. The arrow on the left-hand diagram indicates to calibrated permittivity using Heimovaara's calibration method. This point is located 0.035 ns to the right of the bump apex and corresponds to an electrical length of 0.1956 m. The dashed lines on the left-hand diagram correspond to the positions of the lines used to measure travel time on the right-hand diagram.
