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+\section{Contents of a \dir{mc} Directory}\label{sect:mcdir}
+
+This directory contains information generated by the \moc{MC:} multigroup Monte Carlo
+module.
+
+\subsection{State vector content for the \dir{mc} data structure}\label{sect:mcstate}
+
+The dimensioning parameters for the \dir{mc} data structure, which are stored in
+the state vector $\mathcal{S}^{mc}$, represent:
+
+\begin{itemize}
+\item Nominal number of source histories $M$ per $K_{\rm eff}$ cycle $N_{\rm nsrck}=\mathcal{S}^{mc}_{1}$
+\item Number of source cycles $I_{\rm c}$ to skip before $K_{\rm eff}$ accumulation $N_{\rm ikz}=\mathcal{S}^{mc}_{2}$
+\item Total number of cycles $N$ in the problem $N_{\rm kct}=\mathcal{S}^{mc}_{3}$
+\item Initial seed for the random number generator $S=\mathcal{S}^{mc}_{4}$
+\item N2N processing flag $F=\mathcal{S}^{mc}_{5}$
+\begin{displaymath}
+F = \left\{
+\begin{array}{ll}
+0 & \textrm{do not use information in the {\tt 'N2N} and {\tt 'N3N} records} \\
+1 & \textrm{use information in the {\tt 'N2N} and {\tt 'N3N} records to perform
+the random walk}
+\end{array} \right.
+\end{displaymath}
+\item Type of tallies $T=\mathcal{S}^{mc}_{6}$
+\begin{displaymath}
+T = \left\{
+\begin{array}{ll}
+0 & \textrm{no tallies} \\
+1 & \textrm{effective multiplication factor tally} \\
+2 & \textrm{effective multiplication factor {\sl and} macrolib tallies}
+\end{array} \right.
+\end{displaymath}
+\item The number of homogenized mixtures in the macrolib tally ${M_{\rm out}}=\mathcal{S}^{mc}_{7}$ 
+\item The number of condensed energy groups in the macrolib tally ${G_{\rm out}}=\mathcal{S}^{mc}_{8}$ 
+\item The number of regions in the initial geometry ${N_{\rm in}}=\mathcal{S}^{mc}_{9}$ 
+\end{itemize}
+
+\subsection{The main \dir{mc} directory}\label{sect:mcdirmain}
+
+The following records and sub-directories will be found on the first level of a \dir{mc}
+directory:
+
+\begin{DescriptionEnregistrement}{Main records and sub-directories in \dir{mc}}{8.0cm}
+\CharEnr
+  {SIGNATURE\blank{3}}{$*12$}
+  {Signature of the \dir{mc} data structure ($\mathsf{SIGNA}=${\tt L\_MC\blank{8}}).}
+\IntEnr
+  {STATE-VECTOR}{$40$}
+  {Vector describing the various parameters associated with this data structure
+  $\mathcal{S}^{mc}_{i}$, as defined in \Sect{mcstate}.}
+\RealEnr
+  {K-EFFECTIVE\blank{1}}{$1$}{}
+  {Effective multiplication factor $K_{\mathrm{eff}}$}
+\RealEnr
+  {K-EFFECTI-SD}{$1$}{}
+  {Standard deviation of the effective multiplication factor $\Delta K_{\mathrm{eff}}$}
+\OptIntEnr
+  {REF:IMERGE\blank{2}}{$N_{\rm in}$}{$T =2$}
+  {Merged region number associated with each of the original region number in the macrolib tally $M_{r}$}
+\OptIntEnr
+  {REF:IGCOND\blank{2}}{$G_{\rm out}$}{$T =2$}
+  {Reference group limits associated with the condensed groups in the macrolib tally $C_{g}$}
+\OptDirEnr
+  {MACROLIB\blank{4}}{$T =2$}
+  {Directory containing the \dir{macrolib} structure associated with the
+  macrolib tally, following the specification presented in \Sect{macrolibdirmain}.}
+\end{DescriptionEnregistrement}