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