The authors gratefully acknowledge financial support from Deutsche Forschungsgemeinschaft (DFG) via the research training school GRK 1896: “In-Situ Microscopy with Electrons, X-rays and Scanning Probes” and the collaborative research center SFB 953 “Synthetic Carbon Allotropes”. Work at the Molecular Foundry was supported by the Office of Science, Office of Basic Energy Sciences, of the U.S. Department of Energy under Contract No. DE-AC02-05CH11231.
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