deletions | additions       diff --git a/Light curves.tex b/Light curves.tex  index f331a07..eb90e65 100644  --- a/Light curves.tex  +++ b/Light curves.tex 
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Measured time delays constrain the time delay distance   \begin{equation}   D_{\Delta t} = \frac{d_l d_s}{d_{ls} d_s}{d_{ls}}  \end{equation}   where $d_l$ is the angular diameter distance between observer and lens, $d_s$ between observer and   source, and $d_{ls}$ between lens and source. Note that because of spacetime curvature the lens-source