Nature 420, 393–395 (2002).
The small round spot visible in Fig. 3 does not represent the actual emission pattern, but is an artefact caused by a low-operation voltage of the micro-channel plate. This measurement error has no effect on the value of the reduced brightness as it was not determined from the measurement of the emission pattern.
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The online version of the original article can be found at 10.1038/nature01233
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de Jonge, N., Lamy, Y., Schoots, K. et al. Correction: Corrigendum: High brightness electron beam from a multi-walled carbon nanotube. Nature 423, 461 (2003). https://doi.org/10.1038/nature01620
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DOI: https://doi.org/10.1038/nature01620
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