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<H3><A NAME="SECTION00841300000000000000">
ANALYSE/ROMAFOT</A>
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<TT>ANALYSE/ROMAFOT</TT>
<FONT SIZE="-1"><TT>frame [cat_tab] [int_tab] [sigma,sat]</TT></FONT>
<P>
This command is the most interactive part in the reduction procedure.
Because of its flexibility, its use may not seem straightforward.
Therefore, after starting up the command, the user is advised to press
the key ``H'': it will display the help information the screen.
For the sake of clarity only those commands which are useful
at this stage will be discussed below; other commands of the
<TT>ANALYSE/ROMAFOT</TT> will be discussed later.
<P>
After having received the appropriate input from the MIDAS command
line, the command waits for a command input. Following the present
example, the user should type ``D'' and a number. The command then
asks for a number, say <I>n</I>, and will read the data for the
<!-- MATH: $n^{\rm th}$ -->
<IMG
WIDTH="60" HEIGHT="58" ALIGN="BOTTOM" BORDER="0"
SRC="img208.gif"
ALT="$n^{\rm th}$">
group of components stored in the intermediate table.
<TT>ANALYSE/ROMAFOT</TT> will display the data profiles and the fit
superimposed on the upper part of the image display. On the lower
part of the screen, three images are shown: the subframe containing
the real data, the subframe containing the fit and the difference
of the two, respectively.
<P>
The user can squeeze the interval over which the 256 colours are
distributed through the command ``W'' or vary the minimum of such
an interval with the command ``U''. In order to have a better check of
the correspondence between the data and the fit, the command ``X''
displays isophotes at three different levels. The key ``Y'' has the
same function but starts at a level given by the user (typical
numbers are 0.01 to 0.001).
Another command useful for display is ``6'' which allows the smoothing
of the subframe containing the real data. This smoothing is performed
via a
<!-- MATH: $3 \times 3$ -->
<IMG
WIDTH="9" HEIGHT="35" ALIGN="MIDDLE" BORDER="0"
SRC="img209.gif"
ALT="$3 \times 3$">
gaussian convolution mask on the array stored in
memory and does not affect the original array.
<P>
By means of the displayed information one can decide if the fit is
adequate or for example systematically wrong (for instance, all the
images have overestimated <IMG
WIDTH="44" HEIGHT="54" ALIGN="BOTTOM" BORDER="0"
SRC="img210.gif"
ALT="$\sigma$">'s or heights). In the latter case
<TT>FIT/ROMAFOT</TT> can be run with different parameters.
The procedure continues with ``D'', <I>n</I>+1, <I>n</I>+2, ...... etc.
<P>
A mean of all fits obtained will finally give the <IMG
WIDTH="44" HEIGHT="54" ALIGN="BOTTOM" BORDER="0"
SRC="img211.gif"
ALT="$\sigma$">
of the PSF.
Since <IMG
WIDTH="44" HEIGHT="72" ALIGN="MIDDLE" BORDER="0"
SRC="img212.gif"
ALT="$\beta$">
had been already fixed, the PSF is now determined.
<P>
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<ADDRESS>
<I>Petra Nass</I>
<BR><I>1999-06-15</I>
</ADDRESS>
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