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+\subsection{Contents of \dir{matex} data structure}\label{sect:matex}
+
+\vskip 0.2cm
+A \dir{matex} data structure is used to store several information related
+to the reactor extended material index and geometry. This object has a
+signature {\tt L\_MATEX}; it is created using the \moc{USPLIT:} module.
+The information contained in this data structure can be used and updated
+in other DONJON modules.
+
+\subsubsection{The state-vector content}\label{sect:matexstate}
+
+\noindent
+The dimensioning parameters $\mathcal{S}_i$, which are stored in the state
+vector for this data structure, represent:
+
+\begin{itemize}
+
+\item The number of energy groups $N_{gr} = \mathcal{S}_1$
+
+\item The maximum number of material mixtures $N_m = \mathcal{S}_2$
+($N_m$ equals to the total \\
+number of material regions plus the number of device mixtures)
+
+\item The number of reflector types $N_r = \mathcal{S}_3$
+
+\item The number of fuel types $N_f = \mathcal{S}_4$
+
+\item The total number of mixtures indices $N_{tot} = \mathcal{S}_5$
+($N_{tot}$ equals to the total \\
+number of mesh-splitted volumes plus the number of device mixtures)
+
+\item The type of reactor geometry $I_g = \mathcal{S}_6$
+(only $I_g=7$ for \dusa{3D}-Cartesian geometry or $I_g=9$ for
+\dusa{3D}-Hexagonal geometry are allowed)
+
+\item The total number of mesh-splitted volumes $N_{el} = \mathcal{S}_7$
+
+\item The number of mesh-splitted volumes along x-axis $L_x = \mathcal{S}_8$
+
+\item The number of mesh-splitted volumes along y-axis $L_y = \mathcal{S}_9$
+
+\item The number of mesh-splitted volumes along z-axis $L_z = \mathcal{S}_{10}$
+
+\end{itemize}
+
+\subsubsection{The \dir{matex} directory}\label{sect:matexdir}
+
+\noindent
+The following records will be found on the \dir{matex} directory:
+
+\begin{DescriptionEnregistrement}{Records in \dir{matex} data structure}{7cm} 
+
+\CharEnr
+ {SIGNATURE\blank{3}}{$*12$}
+ {Signature of the \dir{matex} data structure ($\mathsf{SIGNA}=${\tt L\_MATEX\blank{5}}).}
+
+\IntEnr
+ {STATE-VECTOR}{$40$}
+ {Vector describing the various parameters associated with this data structure $\mathcal{S}_i$}
+
+\IntEnr
+ {RMIX\blank{8}}{$N_r$}
+ {The reflector-type mixture indices, as defined in the reactor geometry.}
+
+\IntEnr
+ {RTOT\blank{8}}{$N_r$}
+ {The total number of reflector regions per each reflector type.}
+
+\IntEnr
+ {FMIX\blank{8}}{$N_f$}
+ {The fuel-type mixture indices, as defined in the reactor geometry.}
+
+\IntEnr
+ {FTOT\blank{8}}{$N_f$}
+ {The total number of fuel regions per each fuel type.}
+
+\IntEnr
+ {MAT\blank{9}}{$N_{tot}$}
+ {The material mixture indices per each region and including the device
+  mixtures. The fuel-type indices are set negative; the device indices are
+  appended at the end of vector; the virtual-region indices are set to 0.}
+
+\IntEnr
+ {INDEX\blank{7}}{$N_{el}$}
+ {The renumbered mixture indices. A unique number is associated
+  with each mesh-splitted volume. The device indices are not included;
+  the virtual-region indices are set to 0.}
+
+\RealEnr
+ {MESHX\blank{7}}{$L_x+1$}{}
+ {The mesh-splitted coordinates along x-axis of the reactor geometry.}
+
+\RealEnr
+ {MESHY\blank{7}}{$L_y+1$}{}
+ {The mesh-splitted coordinates along y-axis of the reactor geometry.}
+
+\RealEnr
+ {MESHZ\blank{7}}{$L_z+1$}{}
+ {The mesh-splitted coordinates along z-axis of the reactor geometry.}
+
+\RealEnr
+ {H-FACTOR\blank{4}}{$N_m, N_{gr}$}{}
+ {The h-factors per each mixture and per each energy group,
+  as recovered from the extended \dir{macrolib} data structure.}
+
+\end{DescriptionEnregistrement}
+\clearpage