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<H3><A NAME="SECTION003031200000000000000">
Initializing keywords</A>
</H3>
<P>
The keywords contain all necessary parameters (see Chapter 6, Sect. 1.9
of the Vol. B for a complete list). <TT>SET/CONTEXT long</TT> will set all
relevant keywords to their default values. To override the defaults, three
possibilities exist:
<P>
<DL COMPACT>
<DT>1.
<DD>Terminal input (see also MIDAS Users Manual Sect. 3.2.3, Volume A),
e.g.:
<BR> <BR>
Midas...> <TT>WLC = ``<B>ccd0045</B> ''</TT> <BR>
Midas...> <TT>DCX(2) = 4</TT> <BR>
<P>
Note that adding some blanks at the end of a string to be entered into a
character-type keyword may be a good idea in case the previous contents
was a longer character string. Also it is mandatory to leave at least one
blank on each side of the equal sign (=).
<P>
<DT>2.
<DD>Using the command <TT>SET/LONG</TT>. This form is safer since keyword
names are checked and the syntax is more flexible. The command:
<BR> <BR>
Midas...> <TT>SET/LONG WLC =<B>ccd0045</B> DC=,4</TT> <BR>
<P>
is equivalent to the two commands above. It can be noted that no
blanks are necessary at the end of the strings and that spaces before or
after the assignment symbol (=) can be freely added or removed.
Keyword names can also be truncated to their shortest significant part.
<P>
<DT>3.
<DD>Restoring the values saved in a previous session with:
<BR> <BR>
Midas...> <TT>INIT/LONG</TT> <B>session</B> <BR>
<P>
where <B>session</B> is the name of a table
created at the end of a previous session
by the command:
<BR> <BR>
Midas...> <TT>SAVE/LONG</TT> <B>session</B> <BR>
<P>
</DL>
<P>
Generally, if parameters required for commands of the long slit package are
omitted, their values will be taken from the associated keywords.
Also, if a value is provided on-line to a command, it will change the value
of the corresponding keyword. To display the current keyword values, type:
<BR> <BR>
Midas...> <TT>SHOW/LONG</TT> <BR>
<P>
Since there is an important number of keywords involved in the package,
the command <TT>SHOW/LONG</TT> is organized in sections, <I>e.g.</I>:
<BR> <BR>
Midas...> <TT>SHOW/LONG g</TT> for general formats information <BR>
Midas...> <TT>SHOW/LONG d</TT> for dark, bias and flat-field corrections <BR>
Midas...> <TT>SHOW/LONG w</TT> for wavelength calibration keywords <BR>
Midas...> <TT>SHOW/LONG r</TT> for resampling keywords <BR>
Midas...> <TT>SHOW/LONG e</TT> for extraction keywords <BR>
Midas...> <TT>SHOW/LONG f</TT> for flux calibration keywords <BR>
<BR>
Information can also be obtained on the keywords with <TT>HELP/LONG</TT>, as in:
<BR> <BR>
Midas...> <TT>HELP/LONG wlcmtd</TT> <BR>
<P>
which provides the type, default value, description and current value of the
keyword
<!-- MATH: $\fbox{WLCMTD}$ -->
<IMG
WIDTH="118" HEIGHT="29" ALIGN="BOTTOM" BORDER="0"
SRC="img1016.gif"
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A list of keywords and command names of the
context Long is provided in Chapter 6 of the Volume B (Sect. 1.8 and 1.9).
<P>
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<ADDRESS>
<I>Petra Nass</I>
<BR><I>1999-06-15</I>
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