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<H3><A NAME="SECTION003034200000000000000">
Line Identification</A>
</H3>
<P>
In order to compute the dispersion relation, lines stored in table
<B>line.tbl</B> have to be cross-identified with a reference catalogue
<!-- MATH: $\fbox{LINCAT}$ -->
<IMG
WIDTH="98" HEIGHT="29" ALIGN="BOTTOM" BORDER="0"
SRC="img1031.gif"
ALT="\fbox{LINCAT}">.
For the first few spectral lines in the central row,
this has to be done interactively, the rest is automatic. The sequence:
<BR> <BR>
Midas...> <TT>SET/LONG LINCAT=<B>hear.tbl</B></TT>
<BR>
Midas...> <TT>IDENTIFY/LONG</TT>
<BR>
<BR>
plots the central row of the comparison spectrum
<!-- MATH: $\fbox{WLC}$ -->
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on
the graphics device and activates the graphic cursor.
The lines are selected by positioning the graphics cursor
on them and clicking the left-hand mouse button or Return.
On the session terminal you will be prompted for the wavelength (to be entered
in the same unit as in
<!-- MATH: $\fbox{LINCAT}$ -->
<IMG
WIDTH="98" HEIGHT="29" ALIGN="BOTTOM" BORDER="0"
SRC="img1033.gif"
ALT="\fbox{LINCAT}">). The command will search for a
corresponding entry in table <B>line.tbl</B>. If it is found, the wavelength
you enter interactively will be
stored in the column :IDENT of table <B>line.tbl</B>.
An asterisk, `` * '', will delete a previously made identification. To exit,
click the middle mouse button on the graphics device.
<P>
At least 2 lines have to be identified interactively, but it
is safer to identify a few more, especially
if the dispersion relation is sensibly non-linear. They should
be evenly distributed over the relevant range in wavelength. The
identifications can be checked with:
<BR> <BR>
Midas...> <TT>PLOT/IDENT</TT> <BR>
<BR>
which plots the central row of the comparison spectrum and
the interactive line identifications.
<P>
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<ADDRESS>
<I>Petra Nass</I>
<BR><I>1999-06-15</I>
</ADDRESS>
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