\section{Science use cases for Time Series}
\label{sect:usecases}
Different science use cases for Time Series have been collected and described in by \cite{solano2012} and can be found under \url{http://wiki.ivoa.net/twiki/bin/view/IVOA/CSPTimeSeries}. The set of eight science cases was grouped according to their common requirements into three groups: 
\begin{itemize}
\item \textbf{Group A} Common requirement: Combine photometry and light curves of a given object/list of objects in the same photometric band
\item \textbf{Group B} Common requirement: Combine photometry and light curves of a given object/list of objects in different photometric bands
\item \textbf{Group C} Common requirement: Time series other than light curves
\end{itemize}

\begin{table}
  \begin{center}
  \begin{tabular}{|c|c|c|c|c|c|}
    \hline
    Science      & Target(s) &  Datatype    & Time & Brightness & Photometric \\
    Case         &           &              &      &            & Band        \\
    \hline
    Group A      &  yes      &  lightcurves &  yes &    yes     &      one         \\
    Group B      &  yes      &  lightcurves &  yes &    yes     &      several     \\
    Group C      &  yes      &  other       &  yes &    no      &      no          \\
    \hline
  \end{tabular}
  \end{center}
\end{table}

Add LSST and LIGO cases.