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. 2017 Dec 1;3(12):eaao4862. doi: 10.1126/sciadv.aao4862

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Copyright © 2017 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. 2 — (A) Pictures of the PBCs taken by cameras and microscopes. (B) The thickness of the narrow and wide modules consists of papers. (C) Table of the widths and deviations of the narrow bar, the narrow space, the wide bar, and the wide space.