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\subsection{Detectors}  The detector designs developed for the ILC~\cite{ILC:Detector} ILC~\cite{ILC:Detectors}  or for CLIC~\cite{cite:CLICDR} include a highly granular calorimetry, called imaging calorimetry, for particle-flow purposes. The 3D granularity allows hadron showers to be tracked individually, towards an optimally efficient neutral hadron identification, hence a better energy resolution for jets. This technical choice, however, poses power dissipation and cooling challenges. The solution of pulsed electronics, chosen for linear colliders, cannot be exploited at circular colliders because of the large repetition rate. While the use of imaging calorimetry will be included in the forthcoming design study, more conservative choices have therefore been made so far in the evaluation of the TLEP physics case potential. For example, a study -- carried out in Ref.~\cite{cite:1208.1662} with full simulation of the CMS detector at $\sqrt{s} = 240$ GeV -- demonstrated that the Higgs coupling accuracy is close to being optimal even with a more conventional detector. The underlying reason is that the precise measurement of jet energies is most often not a determining factor in $\epem$ collisions: for events with no or little missing mass, jet energies can be determined with high precision from their directions, making use of energy-momentum conservation.