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\subsection{The \tt{PSP:} module}\label{sect:PSPData}
The \moc{PSP:} module is used to generate a graphical file in a PostScript ASCII format for a DRAGON 2-D
geometry which can be analyzed using the \moc{EXCELT:} or \moc{NXT:} tracking module (see Sections.~\ref{sect:EXCELLData}
and~\ref{sect:NXTData}). The module \moc{PSP:}
is based on the PSPLOT Fortran library from Nova Southeastern University.\cite{PSPLOT} Since only a few
PSPLOT routines were required and because additional PostScript routine not present in the original package were
needed, the routines have been completely readapted to DRAGON. These routines are no longer machine dependent.
The PostScript files generated by DRAGON can be viewed by any PostScript viewer, such as Ghostview\cite{GHOSTVIEW}
or sent to a printer compatible with this language. In DRAGON the \moc{PSP:} module is activated using the following
list of commands:
\begin{DataStructure}{Structure \dstr{PSP:}}
\dusa{PSGEO} \moc{:=} \moc{PSP:} \dusa{PSGEO} $\{$ \dusa{GEONAM} $|$ \dusa{TRKNAM} $\}$ $[$ \dusa{FLUNAM} $]$ \moc{::} \dstr{descpsp}
\end{DataStructure}
\noindent where
\begin{ListeDeDescription}{mmmmmmm}
\item[\dusa{PSGEO}] {\tt character*12} name of the file that will contain the graphical description in a POSTSCRIPT
format. This file must have a sequential ASCII format.
\item[\dusa{GEONAM}] {\tt character*12} name of a read-only {\sc geometry} (see Section \Sect{GEOData}).
\item[\dusa{TRKNAM}] {\tt character*12} name of an NXT or EXCELL type read-only {\sc tracking} (see Sections.~\ref{sect:EXCELLData}
and~\ref{sect:NXTData}).
\item[\dusa{FLUNAM}] {\tt character*12} name of an optional read-only {\sc fluxunk} (see \Sect{FLUData}). It is required only
if a flux mapping plot is requested.
\item[\dstr{descpsp}] structure containing the input data to this module (see \Sect{PSPdesc}).
\end{ListeDeDescription}
\subsubsection{Data input for module {\tt PSP:}}\label{sect:PSPdesc}
\begin{DataStructure}{Structure \dstr{descpsp}}
$[$ \moc{EDIT} \dusa{iprint} $]$ \\
$[$ \moc{FILL} $\{$ \moc{NONE} $|$ \moc{GRAY} $|$ \moc{RGB} $|$ \moc{CMYK} $|$ \moc{HSB} $\}~[$ \moc{NOCONTOUR} $]~]$ \\
$[$ \moc{TYPE} $\{$ \moc{REGION} $|$ \moc{MIXTURE} $|$ \moc{FLUX} $|$ \moc{MGFLUX} $\}~]$
\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. It must be set to 0 if no printing on the output
file is required.
\item[\moc{FILL}] keyword to specify the drawing options.
\item[\moc{NONE}] keyword to specify that only region contour are to be drawn.
\item[\moc{GRAY}] keyword to specify that the regions will be filled with various levels of gray.
\item[\moc{RGB}] keyword to specify that the regions will be filled with various colors taken using the RGB color
scheme.
\item[\moc{CMYK}] keyword to specify that the regions will be filled with various colors taken using the CMYK
color scheme.
\item[\moc{HSB}] keyword to specify that the regions will be filled with various colors taken using the HSB color
scheme. This is the default option.
\item[\moc{NOCONTOUR}] keyword to specify that the contour lines delimiting each region will not be drawn.
\item[\moc{TYPE}] keyword to specify the type of graphics generated.
\item[\moc{REGION}] keyword to specify that different colors or gray levels will be associated with each region. This
is the default option.
\item[\moc{MIXTURE}] keyword to specify that different colors or gray levels will be associated with each mixture.
\item[\moc{FLUX}] keyword to specify that the group integrated flux is to be drawn.
\item[\moc{MGFLUX}] keyword to specify that the group flux is to be drawn.
\end{ListeDeDescription}
\eject
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