Fig. 7.
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Typical TNR spectrum in monopole mode, recorded on February 29, 2020 at 00:45:07.02. The PCDU and RW spurious peaks are indicated by the blue and red vertical lines, respectively. In addition, we display some of the harmonics (2, 3, 4 6, and 7 for the 120 kHz and 2, 3, 6, and 7 for the 80 kHz) of these two frequencies with dashed vertical lines.
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