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\label{fig:lumi} Instantaneous luminosity, in units of ${\small 10^{33}\cms}$, $10^{33}\cms$,  expected at TLEP (blue), ILC (red) and CLIC (green) at each interaction point, as a function of the centre-of-mass energies, in logarithmic scale. For TLEP, the luminosity at each interaction point is determined in the configuration with four interaction points operating simultaneously, and would increase significantly if less interaction points were considered. The purple curve indicates the luminosity summed over the four interaction points for a direct comparison with its linear counterparts.