The luminosity profile of TLEP as a function of the centre-of-mass energy (Fig. \ref{fig:lumi}) leads to choose a slightly smaller value, \(\sqrt{s}=240\) GeV, where the total number of Higgs bosons produced is maximal, as displayed in Fig. \ref{fig:NumberOfHiggsEvents}. The number of WW fusion events has a broad maximum for centre-of-mass energies between 280 and 360 GeV. It is therefore convenient to couple the analysis of the WW fusion with the scan of the \({\rm t}\bar{\rm t}\) threshold, at \(\sqrt{s}\) around 350 GeV, where the background from the Higgs-strahlung process is smallest and most separated from the WW fusion signal.