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<H3><A NAME="SECTION003042500000000000000">
Rebin to wavelength scale</A>
</H3>
<P>
After completing the wavelength calibration, the
<!-- MATH: $\fbox{\tt Rebin...}$ -->
<IMG
WIDTH="106" HEIGHT="27" ALIGN="BOTTOM" BORDER="0"
SRC="img1094.gif"
ALT="\fbox{\tt Rebin...}">button in the Mainwindow allows to rebin spectra to wavelength.
The Rebinning window offers three methods: linear, quadratic, or
spline transformations. The first two provide flux conservation.
The spline option does not incorporate a detailed conservation of flux.
The button
<!-- MATH: $\fbox{\tt Rebin rbr}$ -->
<IMG
WIDTH="117" HEIGHT="27" ALIGN="BOTTOM" BORDER="0"
SRC="img1095.gif"
ALT="\fbox{\tt Rebin rbr}">
activates the row-by-row solution
corresponding to the MIDAS command <TT>REBIN/RBR</TT>. The button
<!-- MATH: $\fbox{\tt Rebin 2-D}$ -->
<IMG
WIDTH="117" HEIGHT="27" ALIGN="BOTTOM" BORDER="0"
SRC="img1096.gif"
ALT="\fbox{\tt Rebin 2-D}">
resamples by a bivariate polynomial solution
and activates the command <TT>RECTIFY/LONG</TT>. The 2-D solution has
been generated by the wavelength calibration process only if the
option ``Compute 2-D solution'' in the Wavelength Calibration window
has been selected before calibration. The button
<!-- MATH: $\fbox{\tt Rebin table}$ -->
<IMG
WIDTH="140" HEIGHT="27" ALIGN="BOTTOM" BORDER="0"
SRC="img1097.gif"
ALT="\fbox{\tt Rebin table}">allows to generate a table as output format and therefore avoid
to resample the data. This table can be plotted with the button
<!-- MATH: $\fbox{\tt Plot table}$ -->
<IMG
WIDTH="129" HEIGHT="27" ALIGN="BOTTOM" BORDER="0"
SRC="img1098.gif"
ALT="\fbox{\tt Plot table}">.
<P>
Clicking on one of the Rebin buttons pops up a list of <B>.bdf </B>
files in the directory. Click the name of the selected file.
A small prompt window appears requesting the name of the output file. The
default is the input file name with the suffix _<TT>reb</TT>. The
button
<!-- MATH: $\fbox{\tt Plot table}$ -->
<IMG
WIDTH="128" HEIGHT="27" ALIGN="BOTTOM" BORDER="0"
SRC="img1099.gif"
ALT="\fbox{\tt Plot table}">
uses the name of the output table generated
by
<!-- MATH: $\fbox{\tt Rebin table}$ -->
<IMG
WIDTH="140" HEIGHT="27" ALIGN="BOTTOM" BORDER="0"
SRC="img1100.gif"
ALT="\fbox{\tt Rebin table}">.
<P>
The rebinning processes use the <B>Starting</B>, <B>Final</B>
wavelength and <B>Step</B>
parameters defined in the Rebinning window. If these parameters
are not given, default values
derived from the wavelength calibration coefficients are used.
The progress in the rebinning process is reported in the MIDAS window.
<P>
<BR>
<DIV ALIGN="CENTER"><A NAME="fig:xrebin"> </A><A NAME="27992"> </A>
<TABLE WIDTH="50%">
<CAPTION><STRONG>Figure G.6:</STRONG>
Resampling Window</CAPTION>
<TR><TD></TD></TR>
</TABLE>
</DIV>
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<ADDRESS>
<I>Petra Nass</I>
<BR><I>1999-06-15</I>
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