%\cite{Nguyen:FEL2015-TUB02} \bibitem{Nguyen:FEL2015-TUB02} D.C.~Nguyen, P.M.~Anisimov, C.E.~Buechler, and Q.R.~Marksteiner, \textquotedblleft{Distributed Seeding for Narrow-band X-ray Free-Electron Lasers}\textquotedblright, % in \emph{Proc. FEL2015}, TUB02, pp. 301--304, % in \emph{Proc. FEL2015}, Daejeon, Republic of Korea, August 2015, paper TUB02, pp. 301--304, in \emph{Proc. 37th International Free Electron Laser Conference (FEL2015)}, Daejeon, Republic of Korea, August 2015, paper TUB02, pp. 301--304, ISBN: 978-3-95450-134-2, \url{http://accelconf.web.cern.ch/AccelConf/FEL2015/papers/tub02.pdf}, doi:10.18429/JACoW-FEL2015-TUB02, 2015.