deletions | additions       diff --git a/Challenge Structure.tex b/Challenge Structure.tex  index d76fc3e..6acc071 100644  --- a/Challenge Structure.tex  +++ b/Challenge Structure.tex 
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The fourth is the accuracy of the estimator, quantified by the average relative residuals  \begin{equation}  A=\frac{1}{fN}\sum_i A=\frac{1}{fN}|\sum_i  \left(\frac{\tilde{\Delta t}_i - \Delta t_i}{\Delta t}\right) t}\right)|  \end{equation}  The initial function of these metrics is to define a minimal performance threshold that must be passed, in order to guarantee meaningful results in TDC1. To pass TDC0, an analysis team's results must satisfy the following criteria.  
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\subsection{Overall goals and broad criteria for success}  The overall goal of TDC0 and TDC1 is to carry out a blind test of current state of art time-delay estimation algorithms. Criteria for success depend on the time-horizon. At present, time-delay cosmology is limited by the number of lenses with measured light curves and by the modeling uncertainties which are of order 5\% per system. Furthermore, distance measurements are currently in the range of accuracy of 3\%. Therefore, any method that can provide time-delays with realistic uncertainties ($\chi^2<1.5fN$) for the majority ($f>0.75$) of light curves with accuracy $R$ $A$ and precision $P$  better than 3\% can be considered a viable method. In the longer run, with LSST in mind, a desirable goal is to achieve $R<0.01$ $A<0.01$ $P<0.01$  and $\chi^2<1.1 fN$, while keeping $f>0.75$.