%\cite{Curbis:FEL2015-TUD04} \bibitem{Curbis:FEL2015-TUD04} F.~Curbis, E.~Mansten, D.F.~Olsson, and S.~Thorin, \textquotedblleft{Relative Bunch Length Measurements at MAX IV Linac}\textquotedblright, % presented at FEL2015, Daejeon, Republic of Korea, August 2015, paper TUD04, unpublished. presented at the 37th International Free Electron Laser Conference (FEL2015), Daejeon, Republic of Korea, August 2015, paper TUD04, unpublished.