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\subsubsection{\code{Simulation}}  \label{sec:sim}  Metadata relevant to the simulation as a whole whole, such as filepaths and unit information, are stored in a \code{Simulation} object. Initializing a \code{Simulation} object  is then gathered the first step  in any analysis using \code{gadfly} as this is where default values for all subsequent analysis are set, including locating all relevant snapshot files, choosing  a simulation class, which also implements coordinate system, and setting the field names of the default particle properties expected by \code{gadfly}. \Code{Snapshot}s are loaded via \code{Simulation.load_snapshot()}, and the parallel  batch processing methods. functionality described in Section \ref{sec:parallel} is implemented at this level as well.  \subsection{Data Access}  \label{sec:fileIO}