deletions | additions       diff --git a/HigherEnergyUpgrades.tex b/HigherEnergyUpgrades.tex  index da80ba1..6137cc5 100644  --- a/HigherEnergyUpgrades.tex  +++ b/HigherEnergyUpgrades.tex 
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As mentioned above, a centre-of-mass energy of 500 GeV cannot compete with the HL-LHC for the Htt coupling measurement. To reach a similar accuracy in $\epem$ collisions as at HL-LHC (less than 5\%), the upgrade of either ILC up to $\sqrt{s}=1$~TeV or CLIC up to $\sqrt{s}=3$~TeV is needed. A precision of 4\% on the Htt coupling would be achieved with an integrated luminosity of 1~$\inab$ (ILC) or 2~$\inab$ (CLIC). These long-term, multi-billion-dollars, upgrades can probably not be justified by the mere possibility of approaching the HL-LHC precision for this coupling, a decade after then end of HL-LHC collisions.   \subsubsection{The HHH coupling} The measurement of the trilinear Higgs self-coupling $\lambda_{\rm H}$ substantially benefits from higher energy, because of the fast increase of the double-Higgs-boson production cross section, be it in $\epem$ or in proton-proton collisions.