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While this difference may sound anecdotal, it actually has several consequences that directly affect the physics potential of the collider.  \begin{itemize}  \item The In contrast to that arising from initial state radiation, the  exact beam energy spectrum arising from beamstrahlung cannot be predicted theoretically, with great accuracy. Observables dependent on a precise beam-energy knowledge (e.g., Z or W masses, Z width, top quark mass, etc.) therefore profit greatly of the absence of beamstrahlung at TLEP.   \item Cross-sections with a rapid variation as a function of the centre-of-mass energy (e.g., at the Z pole, or ar the WW and $\ttbar$ thresholds) are {\it (i)} larger; and {\it (ii)} better known at TLEP, hence measured with smaller statistical and systematic uncertainties.   \item The forward region of a TLEP detector is essentially free of beamstrahlung photons, which  in contrast to that arising turm tremendously eases both the design of a luminometer and the integrated luminosity measurement.   \item The beam-related backgrounds (photons, $\epem$ pairs) originating  from initial state radiation. beamstrahlung are negligible at TLEP, and so are the parisitic $\gamma\gamma$ collisions, which would otherwise lead to significant pileup in the detector.  \end{itemize}