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\section{The \section{Simulated  Light Curves} \label{sec:light_curves}  For a given quasar Simulating  the steps going from source time series to LSST  observation can (roughly) be schematically described as follows: of a multiply-imaged quasar involves four conceptual steps, which we consider in chronological order.   Schematically, we suppose that:  \begin{enumerate}  \item  The optical quasar's intrinsic  light curve in a given optical  band is generated by at  the accretion disk of the quasar. disk;  \item  The intervening foreground lens  galaxy lenses that light curve into causes multiple imaging, leading to  2 or 4 lensed  light curves applying magnification/amplitude offsets that are offset from the intrinsic light curve (and each other) in both amplitude, due to magnification,  and time delays. time.  \item  Time dependent Time-dependent  amplitude fluctuations are generated \emph{on top of} (and \emph{independently} for) each light curve due to by  microlensing by stars in the lens galaxy (see \S \ref{sec:microlensing}). galaxy.  \item  The delayed and microlensed light curves are simultaneously coarsely sparsely, but simultaneously,  ``sampled'' by an observation at the observations,  which adds add  noise. \end{enumerate}  We now In this section, we  describe the simulation of  each of these steps in some  detail and how they relate to our during the generation of the challenge  mock LSST light curve catalog.