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. 2016 May 5;7:11440. doi: 10.1038/ncomms11440

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(a) Typical radio frequency (RF) spectra for ranges I, II and III of the modulation frequencies presented in Figs 2d and 3a taken with the resolution of 1 kHz. (b) High-resolution (with the resolution of 1 Hz) spectrum with full-width half maximum Δf∼1.5 Hz for narrow peak emission (range I in Fig. 2d) at modulation frequency near 80.61 MHz.