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<H1><A NAME="SECTION00830000000000000000"> </A>
<A NAME="overview-of-romafot"> </A>
<BR>
Overview of ROMAFOT
</H1>
The current MIDAS implementation of ROMAFOT consists of 17 commands which
are listed in Table <A HREF="node85.html#romafot-commands">5.3</A>. In order to be able to
execute these commands the context ROMAFOT should be enabled first. This
can be done using the command <TT>SET/CONTEXT ROMAFOT</TT>.
<BR>
<DIV ALIGN="CENTER"><A NAME="4146"> </A>
<TABLE>
<CAPTION><STRONG>Table 5.1:</STRONG>
ROMAFOT commands</CAPTION>
<TR><TD>
<DIV ALIGN="CENTER">
<TABLE CELLPADDING=3 BORDER="1" ALIGN="CENTER">
<TR><TD ALIGN="LEFT">Command</TD>
<TD ALIGN="LEFT">Description</TD>
</TR>
<TR><TD ALIGN="LEFT">ADAPT/ROMAFOT</TD>
<TD ALIGN="LEFT">Adapt trial values to a new image frame</TD>
</TR>
<TR><TD ALIGN="LEFT">ADDSTAR/ROMAFOT</TD>
<TD ALIGN="LEFT">Add pre-selected subarrays to the original image frame</TD>
</TR>
<TR><TD ALIGN="LEFT">ANALYSE/ROMAFOT</TD>
<TD ALIGN="LEFT">Select objects or analyses the results of the fit procedure</TD>
</TR>
<TR><TD ALIGN="LEFT">CHECK/ROMAFOT</TD>
<TD ALIGN="LEFT">Estimate number and accuracy of artificial objects recovered</TD>
</TR>
<TR><TD ALIGN="LEFT">CBASE/ROMAFOT</TD>
<TD ALIGN="LEFT">Create the base-line for transformation of frame coordinates</TD>
</TR>
<TR><TD ALIGN="LEFT">CTRANS/ROMAFOT</TD>
<TD ALIGN="LEFT">Execute transformation of coordinates on intermediate table</TD>
</TR>
<TR><TD ALIGN="LEFT">DIAPHRAGM/ROMAFOT</TD>
<TD ALIGN="LEFT">Perform aperture photometry</TD>
</TR>
<TR><TD ALIGN="LEFT">EXAMINE/ROMAFOT</TD>
<TD ALIGN="LEFT">Examine quality of the fitted objects; flags them if needed</TD>
</TR>
<TR><TD ALIGN="LEFT">FCLEAN/ROMAFOT</TD>
<TD ALIGN="LEFT">Select subarrays containing artificial objects</TD>
</TR>
<TR><TD ALIGN="LEFT">FIND/ROMAFOT</TD>
<TD ALIGN="LEFT">Select objects from ROMAFOT frame using the image display</TD>
</TR>
<TR><TD ALIGN="LEFT">FIT/ROMAFOT</TD>
<TD ALIGN="LEFT">Determine characteristics of objects by non-linear fitting</TD>
</TR>
<TR><TD ALIGN="LEFT">GROUP/ROMAFOT</TD>
<TD ALIGN="LEFT">Perform an automatic grouping of objects</TD>
</TR>
<TR><TD ALIGN="LEFT">MFIT/ROMAFOT</TD>
<TD ALIGN="LEFT">Fit the PSF using the integral of the PSF (for undersampled data)</TD>
</TR>
<TR><TD ALIGN="LEFT">MODEL/ROMAFOT</TD>
<TD ALIGN="LEFT">Determine subpixel values to be used for the integral of the PSF</TD>
</TR>
<TR><TD ALIGN="LEFT">REGISTER/ROMAFOT</TD>
<TD ALIGN="LEFT">Compute absolute parameters and stores results in final table</TD>
</TR>
<TR><TD ALIGN="LEFT">RESIDUAL/ROMAFOT</TD>
<TD ALIGN="LEFT">Compute difference between original and reconstructed image</TD>
</TR>
<TR><TD ALIGN="LEFT">SEARCH/ROMAFOT</TD>
<TD ALIGN="LEFT">Perform actual search of object above certain threshold</TD>
</TR>
<TR><TD ALIGN="LEFT">SELECT/ROMAFOT</TD>
<TD ALIGN="LEFT">Select objects or stores parameters in intermediate table</TD>
</TR>
<TR><TD ALIGN="LEFT">SKY/ROMAFOT</TD>
<TD ALIGN="LEFT">Determine intensity histogram and background in selected areas</TD>
</TR>
</TABLE></DIV> <A NAME="romafot-commands"> </A> </TD></TR>
</TABLE>
</DIV>
<BR>
ROMAFOT is as interactive as the user wishes. In fact, during a reduction
session the user is often asked to
choose between an interactive or an automatic procedure, including
``greytone'' extremes. Hence, the package leaves it up to the user:
<UL>
<LI>to select program stars,
<LI>to model the subframes to fit,
<LI>to choose the number of components in each subframe,
<LI>to check the data reconstruction.
</UL> For the user one cannot define a fixed set of guidelines for these
decisions, apart from the two obvious considerations that no software can
take the place of the human brain and that the benefit of photometric
precision should be proportional to the cost in terms of human effort.
<P>
As stated above, apart from a part which has to be interactive,
the user can choose between running ROMAFOT in automatic or in
interactive mode. Hence, a number of interactive ROMAFOT commands have
non-interactive ``sister'' command(s) with the same functionality.
Figure <A HREF="node85.html#romafot-reduction-scheme">5.1</A> shows the flow diagram of the
ROMAFOT package. From this diagram it is clear that after determining
the PSF one can continue along two paths.
Figure <A HREF="node85.html#romafot-degree-completeness">5.2</A> visualises the procedure
to insert artificial stars in the original frame in order to estimate
the ability of the program to recover an object and the general
reproducibility of the photometry.
Finally, Figure <A HREF="node85.html#romafot-transfer-procedure">5.3</A> shows the procedure to
use the photometric results (positions and intensities) from the frame
with the best resolution as input for all the other program frames.
<BR>
<DIV ALIGN="CENTER"><A NAME="romafot-reduction-scheme"> </A><A NAME="4178"> </A>
<TABLE WIDTH="50%">
<CAPTION><STRONG>Figure 5.1:</STRONG>
Romafot reduction scheme</CAPTION>
<TR><TD><IMG
WIDTH="1273" HEIGHT="815"
SRC="img187.gif"
ALT="\begin{figure}
\begin{center}
\begin{tabular}{\vert ccccc\vert c\vert}
\hline...
...DUAL/ROMAFOT & & & residuals\\
\hline
\end{tabular} \end{center} \end{figure}"></TD></TR>
</TABLE>
</DIV>
<BR>
<P>
<P>
<BR>
<DIV ALIGN="CENTER"><A NAME="romafot-degree-completeness"> </A><A NAME="4201"> </A>
<TABLE WIDTH="50%">
<CAPTION><STRONG>Figure 5.2:</STRONG>
Romafot procedure to determine accuracy and degree of completeness</CAPTION>
<TR><TD><IMG
WIDTH="1254" HEIGHT="673"
SRC="img188.gif"
ALT="\begin{figure}
\begin{center}
\begin{tabular}{\vert ccccc\vert c\vert}
\hline...
...\
& & CHECK/ROMAFOT & & & \\
\hline
\end{tabular} \end{center} \end{figure}"></TD></TR>
</TABLE>
</DIV>
<BR>
<BR>
<DIV ALIGN="CENTER"><A NAME="romafot-transfer-procedure"> </A><A NAME="4213"> </A>
<TABLE WIDTH="50%">
<CAPTION><STRONG>Figure 5.3:</STRONG>
Romafot procedure to transfer inputs to other program frames</CAPTION>
<TR><TD><IMG
WIDTH="655" HEIGHT="284"
SRC="img189.gif"
ALT="\begin{figure}
\begin{center}
\begin{tabular}{\vert ccccc\vert c\vert}
\hline...
... ANALYSE/ROMAFOT& & & check \\
\hline
\end{tabular} \end{center} \end{figure}"></TD></TR>
</TABLE>
</DIV>
<BR>
<P>
ROMAFOT is fully integrated into the MIDAS environment, which means
that the image display part runs on all display system supported by MIDAS
and that all intermediate and the final results are stores in MIDAS
tables. Obviously, the use of the MIDAS table file system adds a
great deal of flexibility to ROMAFOT, since a large number of MIDAS
commands can be used (e.g. for table emanupulation, displaying,
selection, etc.).
<P>
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<ADDRESS>
<I>Petra Nass</I>
<BR><I>1999-06-15</I>
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