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. Author manuscript; available in PMC: 2009 Oct 30.
Published in final edited form as: J Chem Phys. 2008 Feb 7;128(5):052211. doi: 10.1063/1.2833582

Fig. 10.

Fig. 10

Present state of vacuum electronic devices in terms of the ability of multiple devices types to generate average power at a certain frequency. Figure taken from Granatstein et al. (Ref. 93).