\secA{User Inputs}
\label{sec-param}

Input to the program is provided by means of a parameter
file. Parameters are listed in the file, followed by the value that
should be assigned to them. The syntax used is \texttt{paramName
value}. Parameter names are not case-sensitive, and lines in the input
file that start with \texttt{\#} are ignored. If a parameter is listed
more than once, the latter value is used, but otherwise the order in
which the parameters are listed in the input file is
arbitrary. Example input files can be seen in
Appendix~\ref{app-input}.

If a parameter is not listed, the default value is assumed. The
defaults are chosen to provide a good result (using the reconstruction
method), so the user doesn't need to specify many new parameters in
the input file. Note that the image file \textbf{must} be specified!
The parameters that can be set are listed in Appendix~\ref{app-param},
with their default values in parentheses.

The parameters with names starting with \texttt{flag} are stored as
\texttt{bool} variables, and so are either \texttt{true = 1} or
\texttt{false = 0}. They can be entered in the file either in text or
integer format -- \duchamp\ will read them correctly in either case.

An example input file is included in the distribution tar file. It is
as follows:

\begin{verbatim}
imageFile       your-file-here
logFile         logfile.txt
outFile         results.txt
spectraFile     spectra.ps
minPix          2
flagATrous      1
snrRecon        5.
snrCut          3.
minChannels     3
flagBaseline    1
\end{verbatim}.

You would, of course, replace the ``\texttt{your-file-here}'' with the
FITS file you wanted to search. Further examples are given in
Appendix~\ref{app-input}.