<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN"> <!--Converted with LaTeX2HTML 98.1p1 release (March 2nd, 1998) originally by Nikos Drakos (nikos@cbl.leeds.ac.uk), CBLU, University of Leeds * revised and updated by: Marcus Hennecke, Ross Moore, Herb Swan * with significant contributions from: Jens Lippmann, Marek Rouchal, Martin Wilck and others --> <HTML> <HEAD> <TITLE>Reading the Data</TITLE> <META NAME="description" CONTENT="Reading the Data"> <META NAME="keywords" CONTENT="vol2"> <META NAME="resource-type" CONTENT="document"> <META NAME="distribution" CONTENT="global"> <META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=iso-8859-1"> <LINK REL="STYLESHEET" HREF="vol2.css"> <LINK REL="next" HREF="node506.html"> <LINK REL="previous" HREF="node502.html"> <LINK REL="up" HREF="node501.html"> <LINK REL="next" HREF="node506.html"> </HEAD> <BODY > <!--Navigation Panel--> <A NAME="tex2html7771" HREF="node506.html"> <IMG WIDTH="37" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="next" SRC="icons.gif/next_motif.gif"></A> <A NAME="tex2html7768" HREF="node501.html"> <IMG WIDTH="26" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="up" SRC="icons.gif/up_motif.gif"></A> <A NAME="tex2html7762" HREF="node504.html"> <IMG WIDTH="63" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="previous" SRC="icons.gif/previous_motif.gif"></A> <A NAME="tex2html7770" HREF="node1.html"> <IMG WIDTH="65" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="contents" SRC="icons.gif/contents_motif.gif"></A> <BR> <B> Next:</B> <A NAME="tex2html7772" HREF="node506.html">Pre-processing the spectra</A> <B> Up:</B> <A NAME="tex2html7769" HREF="node501.html">A Typical Session: Cook-book</A> <B> Previous:</B> <A NAME="tex2html7763" HREF="node504.html">Initializing keywords</A> <BR> <BR> <!--End of Navigation Panel--> <H2><A NAME="SECTION003032000000000000000"> Reading the Data</A> </H2> <P> Observation data must be converted to MIDAS data structures before processing and the spectra must be oriented so that the dispersion direction is along the rows of the images, with the wavelength increasing from left to right. The command <TT>INTAPE/FITS</TT> can be used to read FITS files from a magnetic tape or from disk. The commands <TT>ROTATE/CLOCK</TT>, <TT>ROTATE/COUNTER_CLOCK</TT> and <TT>FLIP/IMAGE</TT> enable to perform any rotation by a multiple of 90 degrees and image flipping without interpolating the pixel values. The command <TT>REBIN/ROTATE</TT> can be used for any rotation but in the general case will interpolate the pixel values. <P> <BR><HR> <ADDRESS> <I>Petra Nass</I> <BR><I>1999-06-15</I> </ADDRESS> </BODY> </HTML>
