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+\subsection{The \texttt{FPSPH:} module}
+
+The {\tt FPSPH:} module performs a single fixed-point (aka. Picard) or Newton SPH iteration. This module is intended to be used in
+a {\tt REPEAT UNTIL} loop, implemented in CLE-2000 macro-language, where the macro calculation is explicitely called, as depicted
+in Figs.~\ref{fig:fig_fpsph} and~\ref{fig:fig_fnewton}.
+
+\vskip 0.2cm
+
+\begin{figure}[h!]
+\begin{center}
+\includegraphics[scale=0.85]{Figures/fpsph.eps} 
+\caption{Fixed point SPH iterations.}\label{fig:fig_fpsph}
+\end{center}
+\end{figure}
+
+\begin{figure}[h!]
+\begin{center}
+\includegraphics[scale=0.85]{Figures/flow_newton.eps} 
+\caption{Newton SPH iterations.}\label{fig:fig_fnewton}
+\end{center}
+\end{figure}
+
+\clearpage
+
+The calling specifications are:
+
+\begin{DataStructure}{Structure \moc{FPSPH:}}
+\dusa{OPTIM} \moc{:=} \moc{FPSPH:} $[$ \dusa{OPTIM} $]$ \dusa{MACROLIB} \dusa{MACROREF} \moc{::} \dstr{fpsph\_data}
+\end{DataStructure}
+
+\noindent where
+
+\begin{ListeDeDescription}{mmmmmmmm}
+
+\item[\dusa{OPTIM}] \texttt{character*12} name of the \dds{optimize} object ({\tt L\_OPTIMIZE} signature) containing the
+SPH factors. At the first call, object \dusa{OPTIM} must appear on LHS to receive its initial values. On subsequent calls, object
+\dusa{OPTIM} must appear on both LHS and RHS to be able to update the previous values.
+
+\item[\dusa{MACROLIB}] \texttt{character*12} name of the read-only extended \dds{macrolib} object ({\tt L\_MACROLIB} signature) containing the
+macroscopic cross sections used by the macro-calculation and fluxes produced by the macro-calculation.
+
+\item[\dusa{MACROREF}] \texttt{character*12} name of the read-only extended \dds{macrolib} object ({\tt L\_MACROLIB} signature) containing the
+reference macroscopic cross sections and fluxes.
+
+\item[\dstr{fpsph\_data}] structure containing the data to the module \texttt{FPSPH:} (see Sect.~\ref{sect:lnsr_data}).
+
+\end{ListeDeDescription}
+\vskip 0.2cm
+
+\subsubsection{Data input for module \texttt{FPSPH:}}\label{sect:lnsr_data}
+
+\begin{DataStructure}{Structure \moc{fpsph\_data}}
+$[$ \moc{EDIT} \dusa{iprint} $]$ \\
+$[~$\moc{SPH} $\{$ \moc{PN} $|$ \moc{SN} $\}~]$ \\
+$[$ \moc{GRPMIN} \dusa{ngr1} $]~[$ \moc{GRPMAX} \dusa{ngr2} $]$\\
+$[$ \moc{OUT-STEP-EPS} \dusa{$\epsilon_{ext}$} \\
+$[$ \moc{VAR-VAL-MIN} \dusa{varmin} $]~[$ \moc{VAR-VAL-MAX} \dusa{varmax} $]$ \\
+$[$ \moc{OUT-CONV-TST} {\tt >>} \dusa{$l_{conv}$} {\tt <<} $[$ {\tt >>} \dusa{$rms_{conv}$} {\tt <<} $]~]$ \\
+;
+\end{DataStructure}
+
+\noindent where
+\begin{ListeDeDescription}{mmmmmmmm}
+
+\item[\moc{EDIT}] keyword used to set \dusa{iprint}.
+
+\item[\dusa{iprint}] index used to control the printing in module.
+
+\item[\moc{PN}] keyword to activate a calculation of heterogeneous SPH factors of diffusion, PN or SPN type.
+
+\item[\moc{SN}] keyword to activate a calculation of heterogeneous SPH factors of PIJ, IC, SN or MOC type.
+This is the default option.
+
+\item[\moc{GRPMIN}] keyword used to set the first energy group where SPH correction is applied. By default,
+the first energy group index is used.
+
+\item[\dusa{ngr1}] minimum energy group index where SPH correction is applied.
+
+\item[\moc{GRPMAX}] keyword used to set the last energy group where SPH correction is applied. By default,
+the total number of energy groups in \dusa{MACROLIB} is used.
+
+\item[\dusa{ngr2}] maximum energy group index where SPH correction is applied.
+
+\item[\moc{OUT-STEP-EPS}] keyword used to set the tolerance of SPH iteration convergence inside module {\tt FPSPH:} (default value
+is $1.0 \times 10^{-4}$).
+
+\item[\dusa{$\epsilon_{ext}$}] tolerance value (real or double precision).
+
+\item[\moc{VAR-VAL-MIN}] keyword to specify the minimum values of the SPH factors. These values can also be set in a previous call
+to module {\tt GRAD:}.
+
+\item[\dusa{varmin}] single real value used for all SPH factors.
+
+\item[\moc{VAR-VAL-MAX}] keyword to specify the maximum values of the SPH factors. These values can also be set in a previous call
+to module {\tt GRAD:}.
+
+\item[\dusa{varmax}] single real value used for all SPH factors.
+
+\item[\moc{OUT-CONV-TST}] keyword used to determine if the SPH convergence has been reached.
+
+\item[\dusa{$l_{conv}$}] $=1$ means that SPH convergence has been reached; $=0$ otherwise.
+
+\item[\dusa{$rms_{conv}$}] RMS error of the converged SPH factors.
+
+\end{ListeDeDescription}
+\clearpage