deletions | additions       diff --git a/Z mass and width.tex b/Z mass and width.tex  index fd0f561..5c7a3a5 100644  --- a/Z mass and width.tex  +++ b/Z mass and width.tex 
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\subsubsection{The Z mass and width}  The Z mass was determined at LEP from the line-shape scan to be $91187.5 \pm 2.1$ MeV/$c^2$. The statistical error was 1.2 MeV; it would be below 10 keV at TLEP. The systematic error was dominated by the error related to the beam energy calibration (1.7 MeV). As seen in the previous section, a continuous measurement should allow a reduction to below 100 keV. Other errors include the theoretical uncertainties in the calculation of initial state radiation ( $\le 100 keV$), production of additional lepton pairs ( $\le 300 keV$) and in the theoretical line shape parametrization ( $\le 100 keV$). It is clear that revisiting the QED corrections will be a high priority item when embarking in a new program of precision measurements at TLEP. \\  {\em We consider that 100 keV is an reasonable target goal for the Z mass precision at TLEP}.