<!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>Other Useful Commands</TITLE> <META NAME="description" CONTENT="Other Useful Commands"> <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="previous" HREF="node139.html"> <LINK REL="up" HREF="node136.html"> <LINK REL="next" HREF="node141.html"> </HEAD> <BODY > <!--Navigation Panel--> <A NAME="tex2html3181" HREF="node141.html"> <IMG WIDTH="37" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="next" SRC="icons.gif/next_motif.gif"></A> <A NAME="tex2html3178" HREF="node136.html"> <IMG WIDTH="26" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="up" SRC="icons.gif/up_motif.gif"></A> <A NAME="tex2html3174" HREF="node139.html"> <IMG WIDTH="63" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="previous" SRC="icons.gif/previous_motif.gif"></A> <A NAME="tex2html3180" 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="tex2html3182" HREF="node141.html">Auxiliary Data</A> <B> Up:</B> <A NAME="tex2html3179" HREF="node136.html">Spectral Analysis</A> <B> Previous:</B> <A NAME="tex2html3175" HREF="node139.html">Convolution and Deconvolution</A> <BR> <BR> <!--End of Navigation Panel--> <H2><A NAME="SECTION001064000000000000000"> Other Useful Commands</A> </H2> Interactive continuum determination can be done with the command <TT>NORMALIZE/SPECTRUM</TT> as mentioned above. There are commands to measure the position of spectral features. <TT>CENTER/MOMENT</TT> determines positions from moments whereas <TT>CENTER/GAUSS</TT> fits a Gaussian profile; for very sparsely sampled point spread functions, <TT>CENTER/UGAUSS</TT> is preferred. Optionally, all positions can be stored in a working table file. Measurements of line strengths and equivalent widths can be obtained with the command <TT>INTEGRATE/LINE</TT>. Unwanted spectral features (<I>e.g.</I>, spikes due to particle events) can be interactively removed with <TT>MODIFY/GCURSOR</TT>. The commands <TT>GET/GCURSOR</TT> and <TT>CONVERT/TABLE</TT> provide means to generate artificial images from cursor positions. <P> The fitting package permits the determination of line parameters and additional modelling of the data. <P> <P> <BR><HR> <ADDRESS> <I>Petra Nass</I> <BR><I>1999-06-15</I> </ADDRESS> </BODY> </HTML>