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\subsubsection{\code{Simulation}}  \label{sec:sim}  Metadata relevant to the simulation as a whole, such as filepaths and unit information, are stored in a \code{Simulation} object. Initializing a \code{Simulation} object is 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 coordinate system, and setting the field names of the default particle properties expected by \code{gadfly}. \Code{Snapshot}s \code{Snapshot}s  are loaded via \verb|Simulation.load_snapshot()|, and the parallel batch processing functionality described in Section \ref{sec:parallel} is implemented at this level as well.