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+\subsection{The \moc{MRG:} module}\label{sect:MRGData}
+
+
+The \moc{MRG:} module is used to pre-homogenize a geometry after it has been tracked with the \moc{EXCELT:} module. This module can also be used for
+the same purpose for \moc{NXT:} tracked geometries.\cite{MRG1,MRG2,Harrisson2011a} In addition, \moc{NXT:} based tracking files can
+also be partition using this module. 
+
+The general specifications for this module are presented in \Tabto{MRGDataexcelt}{PARTDatanxtfil}
+
+\begin{DataStructure}{Structure for merging \moc{EXCELT:} tracks}\label{tab:MRGDataexcelt}
+\dusa{TRKENEW} \dusa{TFILENEW}
+\moc{:=} \moc{MRG:}   \dusa{TRKEOLD} \dusa{TFILEOLD} \moc{::}  \dstr{descmrg} 
+\end{DataStructure}
+
+\begin{DataStructure}{Structure for merging \moc{NXT:} tracks}\label{tab:MRGDatanxttrk}
+\dusa{TRKNNEW} \moc{:=} \moc{MRG:}   \dusa{TRKNOLD} \moc{::}  \dstr{descmrg} 
+\end{DataStructure}
+
+\begin{DataStructure}{Structure for partitioning \moc{NXT:} tracking files}\label{tab:PARTDatanxtfil}
+\dusa{TFILEMOD} \dusa{TFILEEXT} \moc{:=} \moc{MRG:}   \dusa{TRKNOLD} \dusa{TFILEOLD} \moc{::}  \dstr{descextr} 
+\end{DataStructure}
+
+\begin{ListeDeDescription}{mmmmmmmm}  
+
+\item[\dusa{TRKENEW}] \verb|character*12| name of the new \dds{tracking} data structure that will contain
+region volume and surface area vectors in addition to region identification pointers and other tracking
+information after the pre-homogenization process.
+
+\item[\dusa{TFILENEW}] \verb|character*12| name of the new \moc{EXCELT:} compatible sequential binary tracking file used to store
+the tracks lengths after the pre-homogenization process has take place. 
+
+\item[\dusa{TFILEMOD}] \verb|character*12| name of the new \moc{NXT:} sequential binary tracking file where the
+lines not-associated with the regions to extract are stored.
+
+\item[\dusa{TFILEEXT}] \verb|character*12| name of the new \moc{NXT:} compatible sequential binary tracking file where the
+lines associated with the regions to extract are stored.
+
+\item[\dusa{TRKEOLD}] \verb|character*12| name of the \dds{tracking} data structure that contains
+region volume and surface area vectors in addition to region identification pointers and other tracking
+information before the pre-homogenization process.
+
+\item[\dusa{TFILEOLD}] \verb|character*12| name of the old sequential binary tracking file used to store
+the tracks lengths before the pre-homogenization process takes place. 
+
+\item[\dstr{descmrg}] structure containing the input data to this module (see \Sect{descmrg}).
+
+\item[\dstr{descextr}] structure containing the input data for track file partitioning process (see \Sect{descextr}).
+
+\end{ListeDeDescription}
+
+
+\subsubsection{Data input for geometry pre-homogenization}\label{sect:descmrg}
+
+\begin{DataStructure}{Structure \dstr{descmrg}}
+$[$ \moc{EDIT} \dusa{iprint} $]$ \\
+$[$ \moc{REGI} (\dusa{irmrg}($i$), $i$=1,\dusa{nreg}) $]$ \\
+$[$ \moc{SURF} (\dusa{ismrg}($i$), $i$=1,\dusa{nsur}) $]$ 
+\end{DataStructure}
+
+\begin{ListeDeDescription}{mmmmmmmm}   
+
+\item[\moc{EDIT}] keyword used to modify the print level \dusa{iprint}.
+
+\item[\dusa{iprint}] index used to control the printing in this module. 
+
+\item[\moc{REGI}] keyword to specify that regions will be pre-homogenized.
+
+\item[\dusa{irmrg}] list of new region numbers associated with old region numbers. Two or more regions can be
+combined together only if they contain the same mixture. The number \dusa{nreg} of region is that printed
+after the execution of the tracking module.
+
+\item[\moc{SURF}] keyword to specify that surfaces will be pre-homogenized.
+
+\item[\dusa{ismrg}] list of new surface numbers associated with old surface numbers. Two or more surfaces can be
+combined together only if they are associated with the same boundary conditions. The number \dusa{nsur} of surfaces is
+that printed after the execution of the tracking module.
+
+\end{ListeDeDescription}
+
+\subsubsection{Data input for tracking file partitioning}\label{sect:descextr}
+
+\begin{DataStructure}{Structure \dstr{descextr}}
+$[$ \moc{EDIT} \dusa{iprint} $]$ \\
+$[$ \moc{EXTR} (\dusa{iext}($i$), $i$=1,\dusa{nreg}) $]$ \\
+\end{DataStructure}
+
+\noindent
+ where
+
+\begin{ListeDeDescription}{mmmmmmmm}   
+
+\item[\moc{EDIT}] keyword used to modify the print level \dusa{iprint}.
+
+\item[\dusa{iprint}] index used to control the printing in this module.
+
+\item[\moc{EXTR}] keyword to specify that the track associated with a specific set of regions will be extracted from
+the reference tracking file.
+
+\item[\dusa{iext}] list of region numbers for track extraction. The number nreg of region is that printed after the execution
+of the tracking module.
+
+\end{ListeDeDescription}
+
+\eject