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. 2018 Jun 8;4(6):eaar6782. doi: 10.1126/sciadv.aar6782

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Copyright © 2018 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC).

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Fig. 4 — The spectra are measured at a central frequency at 9.867 GHz. (A) Multimode oscillation measured with a resolution bandwidth (RBW) of 3 MHz. (B) Single-mode oscillation measured with an RBW of 3 MHz. (C) Single-mode oscillation measured with an RBW of 9.1 kHz. (D) Single-mode oscillation measured with an RBW of 9 Hz.