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<H2><A NAME="SECTION001112000000000000000">
Retrieving demonstration and calibration data</A>
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<P>
Calibration tables are required to provide reference values of
wavelength for Th-Ar arc lamp lines, atmospheric extinction or
standard star fluxes.
<P>
A certain number of tables are distributed
on request in complement to the Midas releases. These tables are
also available on anonymous ftp at the host <B>ftphost.hq.eso.org</B>
(IP number 134.171.40.2). The files to be retrieved are located
in the directory /midaspub/calib and are named README.calib and
calib.tar.Z. Command <TT>SHOW/TABLE</TT> can be used to visualize the
column name and physical units of the tables. Demonstration
data required to execute the tutorial
procedure <TT>TUTORIAL/ECHELLE</TT> are also located on this ftp
server in the directory /midaspub/demo as echelle.tar.Z. FTP access
is also provided on the World Wide Web URL: <BR>
<DIV ALIGN="CENTER">
<B>http://http.hq.eso.org/midas-info/midas.html</DIV>
</B> <BR>
The calibration directory contains other information
such as characteristic curves for ESO filters and CCD detectors, which
can be visualized with the Graphical User Interface XFilter
(command <TT>CREATE/GUI FILTER</TT>).
<P>
<BR>
<DIV ALIGN="CENTER"><A NAME="fig:ech-red"> </A><A NAME="7117"> </A>
<TABLE WIDTH="50%">
<CAPTION><STRONG>Figure 7.1:</STRONG>
Echelle Reduction Scheme</CAPTION>
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\begin{center}
\begin{tabular}{\vert cccc\vert}
\hline
& & & ...
...& & MERGE ORDERS \\
& & & \\
\hline
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<ADDRESS>
<I>Petra Nass</I>
<BR><I>1999-06-15</I>
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