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+\section{Contents of a \dir{fview} data structure}\label{sect:dfview}
+
+This directory contains information generated by the \moc{VAL:} module used to interpolate the diffusion flux computed for Cartesian geometries. The following options of calculations are currently implemented:
+\begin{itemize}
+\item 3D geometries tracked with \moc{TRIVAT:} using \moc{PRIM} (aka, variational collocation) method
+\item 3D geometries tracked with \moc{TRIVAT:} using \moc{DUAL} (aka, Raviart-Thomas) method
+\item 3D geometries tracked with \moc{TRIVAT:} using \moc{MCFD} (aka, nodal collocation) method
+\end{itemize}
+
+\subsection{The state-vector content}\label{sect:fviewstate}
+
+\begin{itemize}
+
+\item The total number of energy group $N_{g} = \mathcal{S}_{1}$
+
+\item The number of mesh along X direction $N_{x} = \mathcal{S}_{2}$
+
+\item The number of mesh along Y direction $N_{y} = \mathcal{S}_{3}$
+
+\item The number of mesh along Z direction $N_{z} = \mathcal{S}_{4}$
+
+\end{itemize}
+
+\subsection{The main \dir{fview} directory}\label{sect:fviewdir}
+
+\begin{DescriptionEnregistrement}{Records and sub-directories
+ in \dir{fview} data structure}{7.0cm}
+\CharEnr
+ {SIGNATURE\blank{3}}{$*12$}
+ {Signature of the \dir{fview} data structure ($\mathsf{SIGNA}=${\tt L\_FVIEW\blank{5}}).}
+
+
+\IntEnr
+  {STATE-VECTOR}{$40$}
+  {Vector describing the various parameters associated with this data structure
+  $\mathcal{S}$}
+
+\RealEnr
+  {MXI\blank{9}}{$N_{x}$}{}
+  {array containing the mesh position along X-direction.}
+
+\RealEnr
+  {MYI\blank{9}}{$N_{y}$}{}
+  {array containing the mesh position along Y-direction.}
+
+\RealEnr
+  {MZI\blank{9}}{$N_{z}$}{}
+  {array containing the mesh position along Z-direction.}
+
+\DirlEnr
+  {FLUX\blank{8}}{$N_{g}$}
+  {List of real arrays. Each component of this list is a real array of dimension $N_{x}*N_{y}*N_{z}$ containing
+   the interpolated values of the flux in the energy group.}
+
+\end{DescriptionEnregistrement}