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 $\ttbar$ 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.