deletions | additions       diff --git a/Light curves.tex b/Light curves.tex  index 33e219c..92636ae 100644  --- a/Light curves.tex  +++ b/Light curves.tex 
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\section{Light Curves and Simulated Data}   \label{sec:light_curves}   The intensity pattern as a function  of time for  a variable sourceover time  is referred to as a its  light curve. For lensed images, each sources, the  light curve follows curves of images follow  the intrinsic variability of the quasar source, but with individual time delays. delays that are different for each image.  Only the relative time delays of each image relative to between  the others is images are  measurable, since the unlensed quasar itself cannot be observed. Of course we do not actually measure a light curve, but rather discrete values of the intensity on at  different nights. The epochs. This  sampling of the light curve, curves, as well as  the noise in the photometric measurementof the intensity,  and external effects causing additional variations in the intensity intensity,  are all complications in estimating the time delays. \subsection{Basics}   \label{sec:basics}