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Also displayed in Fig.~\ref{fig:lumi} are the luminosities expected for two linear collider projects, ILC~\cite{ILC:AcceleratorA,ILCAcceleratorB} ILC~\cite{ILC:AcceleratorA,ILC:AcceleratorB}  and CLIC~\cite{cite:CLICDR}, as a function of the centre-of-mass energy. It is remarkable that the luminosity expected at TLEP is between a factor 5 and three orders of magnitude larger than that expected for a linear collider, at all centre-of-mass energies from the Z pole to the $\ttbar$ threshold, where precision measurements are to be made, hence where the accumulated statistics will be a key feature. Upgrades aimed at delivering luminosities well beyond the values given above are also being investigated -- although they cannot be guaranteed today. Possibilities include beam charge compensation, allowing beamstrahlung effects to be mitigated, as mentioned in Ref.~\cite{cite:1305.6498}. Upgrades to higher centre-of-mass energies are discussed in Section~\ref{sec:VHE-LHC}.