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%\cite{Tarkeshian:FEL2017-WEB01} \bibitem{Tarkeshian:FEL2017-WEB01} R. Tarkeshian, T. Feurer, T. Garvey, M. Hayati, R. Ischebeck, P. Krejcik, \emph{et al.}, % R. Tarkeshian, T. Feurer, T. Garvey, M. Hayati, R. Ischebeck, P. Krejcik, W. Leemans, R. Lehé, Z. Ollmann, E. Prat, S. Reiche, V. Schlott, and S. Steinke, % R. Tarkeshian \emph{et al.}, \textquotedblleft{Characterization of High-Brightness Electron Beams at the Frontiers of Temporal and Spatial Resolution}\textquotedblright, presented at FEL2017, Santa Fe, NM, USA, Aug. 2017, paper WEB01, unpublished. % presented at the 38th Int. Free Electron Laser Conf. (FEL'17), Santa Fe, NM, USA, Aug. 2017, paper WEB01, unpublished.