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. 2019 Feb 1;5(2):eaau3407. doi: 10.1126/sciadv.aau3407

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Copyright © 2019 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. 1 — (A) Schematic representation of measurement setup. (B) Operation principle of LIT. (C and D) Optical microscopy images of two polycrystalline graphene sheets. (E and F) Amplitude images of samples A and B, respectively. The measurement time was 10 min for both samples. Cross-sectional profiles of thermal amplitude along lines 1 to 3 in (E) and (F) are also shown in (G) and (H), respectively.