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<H1><A NAME="SECTION001070000000000000000">&#160;</A>
<A NAME="auxiliary-data-sd">&#160;</A>
<BR>
Auxiliary Data
</H1>
Wavelength calibration and absolute flux determination procedures
require some auxiliary data. Some tables are provided
by the system, but the user can modify or include new information using
the available table commands (Vol. A, Chapter 5). In addition to columns 
of interest to the user, user-supplied tables <I>must</I> have the columns 
and column labels required by the various MIDAS commands they are to be used 
with. 

<P>
For the purpose of the reduction of spectral data, there are three basic 
table structures: 

<P>
a) Line identification tables, used in the wavelength calibration step. 
One column must contain the laboratory (if the reference frame is to be used)
wavelengths in the units desired for the calibrated spectrum.
A sample table with comparison lines of the spectrum He-Ar is available
in <TT>MID_ARC:hear.tbl</TT> it contains lines
in the range from 3600 &#197; to 9300 &#197;  and is suitable for data with 
dispersions between about 5 and 10 &#197;/mm.

<P>
b) Flux tables, used for flux calibration and rectification of spectra. These 
tables contain at least three columns defining for each entry central
wavelength, bin width and flux, with labels <TT>:WAVE</TT>, 
<TT>:BIN_W</TT>, <TT>:FLUX_W</TT>. When composing your own tables, take care that 
the wavelength unit is the same for all three quantities and agrees with 
the one used for the wavelength calibration. Some sample 
flux tables are available in the directory <TT>MID_STANDARD</TT>.
 If you are still preparing 
your observations, note that the data available for the various stars is very 
inhomogeneous whereas the quality of the calibrations depends very sensitively 
on the number and spacing of entries within the spectral range to be observed. 

<P>
c) Sample atmospheric and interstellar extinction<A NAME="5932">&#160;</A>
laws are contained in directory <TT>MID_EXTINCTION</TT>. All
interstellar laws are normalised to 
<!-- MATH: $A_v/E(B-V) = 3.1$ -->
<I>A</I><SUB><I>v</I></SUB>/<I>E</I>(<I>B</I>-<I>V</I>) = 3.1 at 5500 &#197;,
and interpolated and rebinned to a constant step in wavelength (10
&#197; or nm). Note that the wavelength coverage is very different for
various data sets.

<P>
<BR>
<DIV ALIGN="CENTER"><A NAME="5990">&#160;</A>
<TABLE>
<CAPTION><STRONG>Table 6.1:</STRONG>
Standard Stars for Absolute Flux Calibration in system area MID_STANDARD.</CAPTION>
<TR><TD>
  <A NAME="tbl:standard-stars">&#160;</A>  <DIV ALIGN="CENTER">
<TABLE CELLPADDING=3 BORDER="1" ALIGN="CENTER">
<TR><TH ALIGN="LEFT"><B>Filename </B></TH>
<TH ALIGN="CENTER"><B>Ref. </B></TH>
<TH ALIGN="LEFT"><B>Filename </B></TH>
<TH ALIGN="CENTER"><B>Ref. </B></TH>
<TH ALIGN="LEFT"><B>Filename </B></TH>
<TH ALIGN="CENTER"><B>Ref. </B></TH>
</TR>
<TR><TD ALIGN="LEFT"><TT> BD2015</TT></TD>
<TD ALIGN="CENTER">(2)</TD>
<TD ALIGN="LEFT"><TT> GD190</TT></TD>
<TD ALIGN="CENTER">(3)</TD>
<TD ALIGN="LEFT"><TT> HR4963</TT></TD>
<TD ALIGN="CENTER">(4)</TD>
</TR>
<TR><TD ALIGN="LEFT"><TT> HR5573</TT></TD>
<TD ALIGN="CENTER">(4)</TD>
<TD ALIGN="LEFT"><TT> HR6710</TT></TD>
<TD ALIGN="CENTER">(4)</TD>
<TD ALIGN="LEFT"><TT> HR8414</TT></TD>
<TD ALIGN="CENTER">(4)</TD>
</TR>
<TR><TD ALIGN="LEFT"><TT> HR8518</TT></TD>
<TD ALIGN="CENTER">(4)</TD>
<TD ALIGN="LEFT"><TT> HR8747</TT></TD>
<TD ALIGN="CENTER">(4)</TD>
<TD ALIGN="LEFT"><TT> HZ14</TT></TD>
<TD ALIGN="CENTER">(3)</TD>
</TR>
<TR><TD ALIGN="LEFT"><TT> HZ4</TT></TD>
<TD ALIGN="CENTER">(3)</TD>
<TD ALIGN="LEFT"><TT> HZ7</TT></TD>
<TD ALIGN="CENTER">(3)</TD>
<TD ALIGN="LEFT"><TT> L745X4</TT></TD>
<TD ALIGN="CENTER">(3)</TD>
</TR>
<TR><TD ALIGN="LEFT"><TT> L870X2</TT></TD>
<TD ALIGN="CENTER">(3)</TD>
<TD ALIGN="LEFT"><TT> L930X8</TT></TD>
<TD ALIGN="CENTER">(3)</TD>
<TD ALIGN="LEFT"><TT> L970X3</TT></TD>
<TD ALIGN="CENTER">(3)</TD>
</TR>
<TR><TD ALIGN="LEFT"><TT> LB227</TT></TD>
<TD ALIGN="CENTER">(3)</TD>
<TD ALIGN="LEFT"><TT> LDS235</TT></TD>
<TD ALIGN="CENTER">(3)</TD>
<TD ALIGN="LEFT"><TT> LDS749</TT></TD>
<TD ALIGN="CENTER">(3)</TD>
</TR>
<TR><TD ALIGN="LEFT"><TT> LT3218</TT></TD>
<TD ALIGN="CENTER">(1)</TD>
<TD ALIGN="LEFT"><TT> LT7987</TT></TD>
<TD ALIGN="CENTER">(1)</TD>
<TD ALIGN="LEFT"><TT> W485A</TT></TD>
<TD ALIGN="CENTER">(3)</TD>
</TR>
<TR><TD ALIGN="LEFT" COLSPAN=5>(1) Stone, Baldwin, 1983, <I> M.N.R.A.S.</I>, <B> 204</B>, 347</TD>
<TD ALIGN="CENTER">&nbsp;</TD>
</TR>
<TR><TD ALIGN="LEFT" COLSPAN=5>(2) Stone, 1977, <I> Ap. J.</I>, <B> 218</B>, 767</TD>
<TD ALIGN="CENTER">&nbsp;</TD>
</TR>
<TR><TD ALIGN="LEFT" COLSPAN=5>(3) Oke, 1974, <I> Ap. J. Suppl.</I>, <B> 27</B>, 21</TD>
<TD ALIGN="CENTER">&nbsp;</TD>
</TR>
<TR><TD ALIGN="LEFT" COLSPAN=5>(4) Breger, 1976, <I> Ap. J. Suppl.</I>, <B> 32</B>, 7</TD>
<TD ALIGN="CENTER">&nbsp;</TD>
</TR>
<TR><TD ALIGN="LEFT" COLSPAN=5>Flux units are 
<!-- MATH: $10^{-16} {\rm ergs}/{\rm s}/{\rm cm}^2$ -->
<IMG
 WIDTH="118" HEIGHT="48" ALIGN="MIDDLE" BORDER="0"
 SRC="img264.gif"
 ALT="$10^{-16} {\rm ergs}/{\rm s}/{\rm cm}^2$">/ &#197; for 
refs 1, 2 and 3</TD>
<TD ALIGN="CENTER">&nbsp;</TD>
</TR>
<TR><TD ALIGN="LEFT" COLSPAN=5>and 
<!-- MATH: $10^{-13} {\rm ergs}/{\rm s}/{\rm cm}^2$ -->
<IMG
 WIDTH="119" HEIGHT="45" ALIGN="MIDDLE" BORDER="0"
 SRC="img265.gif"
 ALT="$10^{-13} {\rm ergs}/{\rm s}/{\rm cm}^2$">/ &#197; for ref 4</TD>
<TD ALIGN="CENTER">&nbsp;</TD>
</TR>
</TABLE></DIV>  </TD></TR>
</TABLE>
</DIV>
<BR>

<P>
<BR>
<DIV ALIGN="CENTER"><A NAME="6046">&#160;</A>
<TABLE>
<CAPTION><STRONG>Table 6.2:</STRONG>
Extinction Tables in directory MID_EXTINCTION</CAPTION>
<TR><TD>
  <A NAME="tbl:extinction-tables">&#160;</A>  <DIV ALIGN="CENTER">
<TABLE CELLPADDING=3 BORDER="1" ALIGN="CENTER">
<TR><TH ALIGN="LEFT"><B>Filename </B></TH>
<TH ALIGN="CENTER"><B>Description </B></TH>
<TH ALIGN="CENTER"><B>column number  </B></TH>
<TH ALIGN="CENTER"><B>Ref. </B></TH>
</TR>
<TR><TD ALIGN="LEFT"><TT> INSTEXAN</TT></TD>
<TD ALIGN="CENTER">Interstellar: Galaxy(&#197;)</TD>
<TD ALIGN="CENTER">2</TD>
<TD ALIGN="CENTER">(1)</TD>
</TR>
<TR><TD ALIGN="LEFT"><TT> INSTEXAN</TT></TD>
<TD ALIGN="CENTER">Interstellar: LMC (&#197;)</TD>
<TD ALIGN="CENTER">3</TD>
<TD ALIGN="CENTER">(2)</TD>
</TR>
<TR><TD ALIGN="LEFT"><TT> INSTEXAN</TT></TD>
<TD ALIGN="CENTER">Interstellar: SMC (&#197;)</TD>
<TD ALIGN="CENTER">4</TD>
<TD ALIGN="CENTER">(3)</TD>
</TR>
<TR><TD ALIGN="LEFT"><TT> INSTEXAN</TT></TD>
<TD ALIGN="CENTER">Interstellar: LMC (&#197;)</TD>
<TD ALIGN="CENTER">5</TD>
<TD ALIGN="CENTER">(4)</TD>
</TR>
<TR><TD ALIGN="LEFT"><TT> INSTEXAN</TT></TD>
<TD ALIGN="CENTER">Interstellar: Galaxy fit (&#197;)</TD>
<TD ALIGN="CENTER">6</TD>
<TD ALIGN="CENTER">(5)</TD>
</TR>
<TR><TD ALIGN="LEFT"><TT> INSTEXAN</TT></TD>
<TD ALIGN="CENTER">Interstellar: Galaxy fit (&#197;)</TD>
<TD ALIGN="CENTER">7</TD>
<TD ALIGN="CENTER">(6)</TD>
</TR>
<TR><TD ALIGN="LEFT"><TT> INSTEXAN</TT></TD>
<TD ALIGN="CENTER">Interstellar: LMC fit (&#197;)</TD>
<TD ALIGN="CENTER">8</TD>
<TD ALIGN="CENTER">(6)</TD>
</TR>
<TR><TD ALIGN="LEFT"><TT> ATMOEXAN</TT></TD>
<TD ALIGN="CENTER">Atmospheric  (&#197;)</TD>
<TD ALIGN="CENTER">2</TD>
<TD ALIGN="CENTER">(7)</TD>
</TR>
<TR><TD ALIGN="LEFT"><TT> INSTEXNM</TT></TD>
<TD ALIGN="CENTER">Interstellar (nm) <IMG
 WIDTH="8" HEIGHT="21" ALIGN="BOTTOM" BORDER="0"
 SRC="img266.gif"
 ALT="\dag"></TD>
<TD ALIGN="CENTER">-</TD>
<TD ALIGN="CENTER">(1-6)</TD>
</TR>
<TR><TD ALIGN="LEFT"><TT> ATMOEXNM</TT></TD>
<TD ALIGN="CENTER">Atmospheric  (nm) </TD>
<TD ALIGN="CENTER">2</TD>
<TD ALIGN="CENTER">(7)</TD>
</TR>
<TR><TD ALIGN="LEFT" COLSPAN=4>(1) Savage, Mathis, 1979, <I> An.Rev.Astr.Ap.</I>, <B> 17</B>, 73</TD>
</TR>
<TR><TD ALIGN="LEFT" COLSPAN=4>(2) Nandy <I> et al</I>, 1981, <I> MNRAS</I>, <B> 196</B>, 955</TD>
</TR>
<TR><TD ALIGN="LEFT" COLSPAN=4>(3) Prevot <I> et al</I>, 1984, <I> Astron.Astrophys.</I>, <B> 132</B>, 389</TD>
</TR>
<TR><TD ALIGN="LEFT" COLSPAN=4>(4) Koornneef, Code, 1981, <I> Ap. J.</I>, <B> 247</B>, 860</TD>
</TR>
<TR><TD ALIGN="LEFT" COLSPAN=4>(5) Seaton, 1979, <I> M.N.R.A.S.</I>, <B> 187</B>, 73P</TD>
</TR>
<TR><TD ALIGN="LEFT" COLSPAN=4>(6) Howarth, 1983, <I> M.N.R.A.S.</I>, <B> 203</B>, 301</TD>
</TR>
<TR><TD ALIGN="LEFT" COLSPAN=4>(7) T&#252;g, 1977, <I> Messenger</I>, <B> 11</B></TD>
</TR>
<TR><TD ALIGN="LEFT" COLSPAN=4><IMG
 WIDTH="8" HEIGHT="21" ALIGN="BOTTOM" BORDER="0"
 SRC="img268.gif"
 ALT="\dag">The same as <TT> INSTEXAN</TT> but wavelengths in nanometers</TD>
</TR>
<TR><TD ALIGN="LEFT" COLSPAN=4>The same as <TT> ATMOEXNM</TT> but wavelengths in nanometers</TD>
</TR>
</TABLE></DIV>  </TD></TR>
</TABLE>
</DIV>
<BR>

<P>

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