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<H2><A NAME="SECTION002232000000000000000">
The Descriptor Table</A>
</H2>
<P>
The list of pertinent MIDAS descriptors should be stored into a MIDAS table
containing the following columns:
<PRE>
DESCR_INAME (Character Column) contains the list of MIDAS
descriptors to be mapped
into the columns of the OST.
IPOS (Integer Column) contains for each descriptor
the position of the element to be
read.
DESCR_ONAME (Character Column) contains for each descriptor the
label of the column of the OST
in which its values will be stored.
OTYPE (Character Column) contains for each descriptor the
type of the column of the OST in
which its values will be stored.
I (integer), R(eal), D(double
precision), C*n (character string)
</PRE>
<P>
The following columns will be automatically created in the OST:
<BR>
<DL COMPACT>
<DT>1.
<DD>:FILENAME (containing the frame name)
<DT>2.
<DD>:MJD (containing the Modified Julian
Date of the exposure).
</DL>If a descriptor contains more than one element, the one at the position defined
in the column :IPOS is taken.
The table may be created using the commands CREATE/TABLE, CREATE/COLUMN,
and the different parameters may be entered using the Table Editor <BR>
(EDIT/TABLE).
In the future we will supply on anonymous ftp templates for the different ESO
instruments.
<P>
Table <A HREF="node376.html#fig:susidescr">15.2</A> shows a descriptor table created for NTT data
obtained with
the SUSI instrument. (Most of the examples in this document will be based on
this set of 14 SUSI files.)
<P>
<BR>
<DIV ALIGN="CENTER"><A NAME="fig:susidescr"> </A><A NAME="17374"> </A>
<TABLE>
<CAPTION><STRONG>Table 15.2:</STRONG>
A descriptor Table for SUSI exposures</CAPTION>
<TR><TD><IMG
WIDTH="590" HEIGHT="689"
SRC="img894.gif"
ALT="\begin{table}
\centerline{\vbox{\psfig{figure=fig_do_4.ps,bbllx=6.7cm,bblly=9.3cm,bburx=14.7cm,bbury=18.6cm,width=8cm,height=9.3cm}}}
\end{table}"></TD></TR>
</TABLE>
</DIV>
<BR>
<BR><HR>
<ADDRESS>
<I>Petra Nass</I>
<BR><I>1999-06-15</I>
</ADDRESS>
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