<!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>Session Parameters</TITLE> <META NAME="description" CONTENT="Session Parameters"> <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="node169.html"> <LINK REL="up" HREF="node145.html"> <LINK REL="next" HREF="node175.html"> </HEAD> <BODY > <!--Navigation Panel--> <A NAME="tex2html3588" HREF="node175.html"> <IMG WIDTH="37" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="next" SRC="icons.gif/next_motif.gif"></A> <A NAME="tex2html3585" HREF="node145.html"> <IMG WIDTH="26" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="up" SRC="icons.gif/up_motif.gif"></A> <A NAME="tex2html3581" HREF="node173.html"> <IMG WIDTH="63" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="previous" SRC="icons.gif/previous_motif.gif"></A> <A NAME="tex2html3587" 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="tex2html3589" HREF="node175.html">Bibliography</A> <B> Up:</B> <A NAME="tex2html3586" HREF="node145.html">Echelle Spectra</A> <B> Previous:</B> <A NAME="tex2html3582" HREF="node173.html">MIDAS Commands</A> <BR> <BR> <!--End of Navigation Panel--> <H1><A NAME="SECTION0011110000000000000000"> </A> <A NAME="ech:session-parameters"> </A> <BR> Session Parameters </H1> <P> <BR> <DIV ALIGN="CENTER"><A NAME="7542"> </A> <TABLE> <CAPTION><STRONG>Table 7.6:</STRONG> Command parameters (1)</CAPTION> <TR><TD> <DIV ALIGN="CENTER"> <TABLE CELLPADDING=3 BORDER="1" ALIGN="CENTER"> <TR><TD ALIGN="CENTER" COLSPAN=2>Parameters: <TT> CALIBRATE</TT> command (See also next table)</TD> </TR> <TR><TH ALIGN="LEFT"><B>Parameter </B></TH> <TD ALIGN="LEFT" VALIGN="TOP" WIDTH=12><B>Description </B></TD> </TR> <TR><TD ALIGN="LEFT">INSTR</TD> <TD ALIGN="LEFT" VALIGN="TOP" WIDTH=12>Defines the spectrograph (e.g. <TT> CASPEC</TT>, <TT> EFOSC</TT>).</TD> </TR> <TR><TD ALIGN="LEFT">GRATING</TD> <TD ALIGN="LEFT" VALIGN="TOP" WIDTH=12>Defines the grating or instrument configuration.</TD> </TR> <TR><TD ALIGN="LEFT">CCD</TD> <TD ALIGN="LEFT" VALIGN="TOP" WIDTH=12>Defines the CCD.</TD> </TR> <TR><TD ALIGN="LEFT">CCDBIN</TD> <TD ALIGN="LEFT" VALIGN="TOP" WIDTH=12>Binning factor along X and Y. This parameter has impact on the wavelength calibration.</TD> </TR> <TR><TD ALIGN="LEFT">SCAN</TD> <TD ALIGN="LEFT" VALIGN="TOP" WIDTH=12>Limits of the scanned area of the CCD. This parameter has impact on order definition (method Hough) and background estimates.</TD> </TR> <TR><TD ALIGN="LEFT">ORDREF</TD> <TD ALIGN="LEFT" VALIGN="TOP" WIDTH=12>Order reference frame</TD> </TR> <TR><TD ALIGN="LEFT">DEFMTD</TD> <TD ALIGN="LEFT" VALIGN="TOP" WIDTH=12>Order definition method (<TT> STD, COM, HOUGH</TT>).</TD> </TR> <TR><TD ALIGN="LEFT">DEFPOL</TD> <TD ALIGN="LEFT" VALIGN="TOP" WIDTH=12>Degree of the bivariate polynomial used in the definition of the orders, see Section <A HREF="node150.html#order-definition">7.2</A>.</TD> </TR> <TR><TD ALIGN="LEFT">WIDTH1</TD> <TD ALIGN="LEFT" VALIGN="TOP" WIDTH=12>Defines the width in pixels of the orders perpendicular to the dispersion direction. It is used to detect the orders as described in Section <A HREF="node150.html#order-definition">7.2</A> (methods <TT> STD, COM</TT>). Typical values are between 2 and 15, depending on the observing slit.</TD> </TR> <TR><TD ALIGN="LEFT">THRES1</TD> <TD ALIGN="LEFT" VALIGN="TOP" WIDTH=12>Defines the threshold to detect orders on the order reference image as described in Section <A HREF="node150.html#order-definition">7.2</A> (methods <TT> STD, COM</TT>).</TD> </TR> <TR><TD ALIGN="LEFT">SLOPE</TD> <TD ALIGN="LEFT" VALIGN="TOP" WIDTH=12>Mean slope of the orders in pixel space (methods <TT> STD, COM</TT>).</TD> </TR> </TABLE></DIV> <A NAME="command-parameters-1"> </A></TD></TR> </TABLE> </DIV> <BR> <P> <BR> <DIV ALIGN="CENTER"><A NAME="7570"> </A> <TABLE> <CAPTION><STRONG>Table 7.7:</STRONG> Command parameters (2)</CAPTION> <TR><TD> <DIV ALIGN="CENTER"> <TABLE CELLPADDING=3 BORDER="1" ALIGN="CENTER"> <TR><TD ALIGN="CENTER" COLSPAN=2>Parameters: <TT> CALIBRATE</TT> command (Continued)</TD> </TR> <TR><TH ALIGN="LEFT"><B>Parameter </B></TH> <TD ALIGN="LEFT" VALIGN="TOP" WIDTH=12><B>Description </B></TD> </TR> <TR><TD ALIGN="LEFT">NBORDI</TD> <TD ALIGN="LEFT" VALIGN="TOP" WIDTH=12>Number of orders to be detected (method <TT> HOUGH</TT>).</TD> </TR> <TR><TD ALIGN="LEFT">WIDTHI</TD> <TD ALIGN="LEFT" VALIGN="TOP" WIDTH=12>This parameter is used to remove the traces of the orders in Hough space during the detection. Its minimum value is the half-width in pixels of the orders perpendicular to the dispersion direction. Its maximum value is the interorder distance minus the half-width of the orders (method <TT> HOUGH</TT>).</TD> </TR> <TR><TD ALIGN="LEFT">THRESI</TD> <TD ALIGN="LEFT" VALIGN="TOP" WIDTH=12>Defines the threshold for the order detection (equivalent to <TT> THRES1</TT>)</TD> </TR> <TR><TD ALIGN="LEFT">WLC</TD> <TD ALIGN="LEFT" VALIGN="TOP" WIDTH=12>Raw wavelength calibration image.</TD> </TR> <TR><TD ALIGN="LEFT">LINCAT</TD> <TD ALIGN="LEFT" VALIGN="TOP" WIDTH=12>System table with comparison lines.</TD> </TR> <TR><TD ALIGN="LEFT">EXTMTD</TD> <TD ALIGN="LEFT" VALIGN="TOP" WIDTH=12>Extraction method (<TT> AVERAGE, LINEAR, OPTIMAL</TT>).</TD> </TR> <TR><TD ALIGN="LEFT">SLIT</TD> <TD ALIGN="LEFT" VALIGN="TOP" WIDTH=12>Width of the extraction slit in pixels.</TD> </TR> <TR><TD ALIGN="LEFT">OFFSET</TD> <TD ALIGN="LEFT" VALIGN="TOP" WIDTH=12>Offset of the extraction slit. The offset is given in pixels, positive values are above the center and negative offsets are below the center of the orders as shown in the image monitor (command <TT> LOAD/ECHELLE</TT>).</TD> </TR> <TR><TD ALIGN="LEFT">SEAMTD</TD> <TD ALIGN="LEFT" VALIGN="TOP" WIDTH=12>Searching method (<TT> GAUSSIAN, GRAVITY</TT>). This parameter controls the definition of the center of the calibration lines.</TD> </TR> <TR><TD ALIGN="LEFT">WIDTH2</TD> <TD ALIGN="LEFT" VALIGN="TOP" WIDTH=12>Defines the width of the calibration lines in pixels.</TD> </TR> <TR><TD ALIGN="LEFT">THRES2</TD> <TD ALIGN="LEFT" VALIGN="TOP" WIDTH=12>Defines the threshold above the local background to detect comparison lines. The actual value should be chosen to detect about 10 to 20 lines per order.</TD> </TR> <TR><TD ALIGN="LEFT">WLCMTD</TD> <TD ALIGN="LEFT" VALIGN="TOP" WIDTH=12>Wavelength calibration method (<TT> PAIR, ANGLE, TWO-D, GUESS, RESTART, ORDER</TT>). This parameter controls the execution of <TT> IDENTIFY/ECHELLE</TT>.</TD> </TR> <TR><TD ALIGN="LEFT">WLCOPT</TD> <TD ALIGN="LEFT" VALIGN="TOP" WIDTH=12>Dispersion relation option (1D, 2D)</TD> </TR> <TR><TD ALIGN="LEFT">GUESS</TD> <TD ALIGN="LEFT" VALIGN="TOP" WIDTH=12>Optional reference to a previous session with the same instrument configuration, to be used as a guess for the dispersion coefficients (required if <TT> WLCMTD=GUESS</TT>).</TD> </TR> <TR><TD ALIGN="LEFT">WLCVISU</TD> <TD ALIGN="LEFT" VALIGN="TOP" WIDTH=12>Visualisation of intermediate results <TT> (YES/NO)</TT>.</TD> </TR> <TR><TD ALIGN="LEFT">DC</TD> <TD ALIGN="LEFT" VALIGN="TOP" WIDTH=12>Is the degree of the polynomial used in the dispersion relation, see Section <A HREF="node158.html#wavelength-calibration">7.6</A>.</TD> </TR> <TR><TD ALIGN="LEFT">TOL</TD> <TD ALIGN="LEFT" VALIGN="TOP" WIDTH=12>Defines a tolerance window for the last step of single-order computation of the dispersion relations.</TD> </TR> <TR><TD ALIGN="LEFT">WLCLOOP</TD> <TD ALIGN="LEFT" VALIGN="TOP" WIDTH=12>Three parameters to control the iterative identification of lines by improvement of a global solution. <UL> <LI><TT> WLCLOOP</TT>(1) = Minimum initial accuracy of the solution (pixels) <LI><TT> WLCLOOP</TT>(2) = Tolerance on the distance of the nearest neighbours. A value of e.g. 0.2 means that the nearest neighbour must be found at least at 5 times (=1/0.2) the residual to confirm the identification. Optimal values of this parameter are in the range 0. to 0.5. <LI><TT> WLCLOOP</TT>(3) = Maximal allowed accuracy of the loop. </UL></TD> </TR> <TR><TD ALIGN="LEFT">WLCNITER</TD> <TD ALIGN="LEFT" VALIGN="TOP" WIDTH=12>Two parameters for the minimum and maximum number of iterations of the identification loop.</TD> </TR> </TABLE></DIV> <A NAME="command-parameters-2"> </A></TD></TR> </TABLE> </DIV> <BR> <P> <BR> <DIV ALIGN="CENTER"><A NAME="7598"> </A> <TABLE> <CAPTION><STRONG>Table 7.8:</STRONG> Command parameters (3)</CAPTION> <TR><TD> <DIV ALIGN="CENTER"> <TABLE CELLPADDING=3 BORDER="1" ALIGN="CENTER"> <TR><TD ALIGN="CENTER" COLSPAN=2>Parameters: <TT> FLAT</TT> command</TD> </TR> <TR><TH ALIGN="LEFT"><B>Parameter </B></TH> <TD ALIGN="LEFT" VALIGN="TOP" WIDTH=12><B>Description </B></TD> </TR> <TR><TD ALIGN="LEFT">FFOPT</TD> <TD ALIGN="LEFT" VALIGN="TOP" WIDTH=12>Flat-Fielding option (<TT> YES/NO</TT>). If the value <TT> NO</TT> is assigned to this paramter, no Flat-Field correction is performed</TD> </TR> <TR><TD ALIGN="LEFT">FLAT</TD> <TD ALIGN="LEFT" VALIGN="TOP" WIDTH=12>Raw flat field image.</TD> </TR> <TR><TD ALIGN="LEFT">CORRECT</TD> <TD ALIGN="LEFT" VALIGN="TOP" WIDTH=12>Flat field correction image.</TD> </TR> <TR><TD ALIGN="LEFT">BLAZE</TD> <TD ALIGN="LEFT" VALIGN="TOP" WIDTH=12>Smoothed flat field used in the normalisation of the flat field.</TD> </TR> <TR><TD ALIGN="LEFT">BKGMTD</TD> <TD ALIGN="LEFT" VALIGN="TOP" WIDTH=12>Background estimation method (<TT> POLY, SPLINE, SMOOTH</TT>).</TD> </TR> <TR><TD ALIGN="LEFT">BKGVISU</TD> <TD ALIGN="LEFT" VALIGN="TOP" WIDTH=12>Visualisation of intermediate results (<TT> YES/NO</TT>).</TD> </TR> <TR><TD ALIGN="LEFT">BKGSTEP</TD> <TD ALIGN="LEFT" VALIGN="TOP" WIDTH=12>Step in pixels of the grid of background reference positions.</TD> </TR> <TR><TD ALIGN="LEFT">BKGPOL</TD> <TD ALIGN="LEFT" VALIGN="TOP" WIDTH=12>Degree of the bivariate polynomial for background fiting (method <TT> POLY</TT>).</TD> </TR> <TR><TD ALIGN="LEFT">BKGRAD</TD> <TD ALIGN="LEFT" VALIGN="TOP" WIDTH=12>Radius (radx, rady) in pixels of the window for local estimate of the background. The window is parallel to the orders (radx is measured along the orders, rady is parallel to the columns). (method <TT> SPLINE</TT>)</TD> </TR> <TR><TD ALIGN="LEFT">BKGDEG</TD> <TD ALIGN="LEFT" VALIGN="TOP" WIDTH=12>Degree of spline polynomials (method <TT> SPLINE</TT>).</TD> </TR> <TR><TD ALIGN="LEFT">BKGSMO</TD> <TD ALIGN="LEFT" VALIGN="TOP" WIDTH=12>Smoothing factor for smoothing spline interpolation. See Section <A HREF="node152.html#background-definition">7.4</A> (method <TT> SPLINE</TT>).</TD> </TR> <TR><TD ALIGN="LEFT">EXTMTD</TD> <TD ALIGN="LEFT" VALIGN="TOP" WIDTH=12>(See definition in Table <A HREF="node174.html#command-parameters-2">7.7</A>)</TD> </TR> <TR><TD ALIGN="LEFT">SLIT</TD> <TD ALIGN="LEFT" VALIGN="TOP" WIDTH=12>(See definition in Table <A HREF="node174.html#command-parameters-2">7.7</A>)</TD> </TR> <TR><TD ALIGN="LEFT">OFFSET</TD> <TD ALIGN="LEFT" VALIGN="TOP" WIDTH=12>(See definition in Table <A HREF="node174.html#command-parameters-2">7.7</A>)</TD> </TR> <TR><TD ALIGN="LEFT">SAMPLE</TD> <TD ALIGN="LEFT" VALIGN="TOP" WIDTH=12>Defines the wavelength step of the spectrum sampled in wavelengths. It can either be a real number indicating the step in units of Ångstrøm or a reference file corresponding to an image sampled in the space order-wavelength.</TD> </TR> <TR><TD ALIGN="CENTER" COLSPAN=2>Parameters: <TT> FILTER</TT> command</TD> </TR> <TR><TH ALIGN="LEFT"><B>Parameter </B></TH> <TD ALIGN="LEFT" VALIGN="TOP" WIDTH=12><B>Description </B></TD> </TR> <TR><TD ALIGN="LEFT">BKGxxx</TD> <TD ALIGN="LEFT" VALIGN="TOP" WIDTH=12>All background parameters : see definitions above.</TD> </TR> <TR><TD ALIGN="LEFT">MEDFILT</TD> <TD ALIGN="LEFT" VALIGN="TOP" WIDTH=12>widx,widy,no_iter. See help of command <TT> FILTER/ECHELLE</TT>.</TD> </TR> <TR><TD ALIGN="LEFT">CRFILT</TD> <TD ALIGN="LEFT" VALIGN="TOP" WIDTH=12>radx,rady,mthresh.</TD> </TR> <TR><TD ALIGN="LEFT">CCDFILT</TD> <TD ALIGN="LEFT" VALIGN="TOP" WIDTH=12>read-out noise (in e-), inverse gain factor (e-/ADU), threshold (in units of standard deviation).</TD> </TR> </TABLE></DIV> <A NAME="command-parameters-3"> </A></TD></TR> </TABLE> </DIV> <BR> <P> <BR> <DIV ALIGN="CENTER"><A NAME="7647"> </A> <TABLE> <CAPTION><STRONG>Table 7.9:</STRONG> Command parameters (4)</CAPTION> <TR><TD> <DIV ALIGN="CENTER"> <TABLE CELLPADDING=3 BORDER="1" ALIGN="CENTER"> <TR><TD ALIGN="CENTER" COLSPAN=2>Parameters: <TT> RESPONSE</TT> command</TD> </TR> <TR><TH ALIGN="LEFT"><B>Parameter </B></TH> <TD ALIGN="LEFT" VALIGN="TOP" WIDTH=12><B>Description </B></TD> </TR> <TR><TD ALIGN="LEFT">STD</TD> <TD ALIGN="LEFT" VALIGN="TOP" WIDTH=12>Raw Standard star, in <TT> STANDARD</TT> reduction mode.</TD> </TR> <TR><TD ALIGN="LEFT">RESPONSE</TD> <TD ALIGN="LEFT" VALIGN="TOP" WIDTH=12>Computed instrument response in <TT> STANDARD</TT> reduction. If the name <TT> NULL</TT> is assigned to this parameter no response correction is applied in the <TT> REDUCE</TT> command. Instead, the blaze function is fitted.</TD> </TR> <TR><TD ALIGN="LEFT">FLUXTAB</TD> <TD ALIGN="LEFT" VALIGN="TOP" WIDTH=12>Table with absolute fluxes for the Standard star, in <TT> STANDARD</TT> reduction mode. The tables are in the area <TT> MID_STANDARD</TT></TD> </TR> <TR><TD ALIGN="LEFT">FILTMED</TD> <TD ALIGN="LEFT" VALIGN="TOP" WIDTH=12>Radius in x and y, threshold, as in command <TT> FILTER/MEDIAN</TT> used to smooth the response function.</TD> </TR> <TR><TD ALIGN="LEFT">FILTSMO</TD> <TD ALIGN="LEFT" VALIGN="TOP" WIDTH=12>Radius in x and y, threshold, as in command <TT> FILTER/SMOOTH</TT> used to smooth the response function.</TD> </TR> <TR><TD ALIGN="LEFT">PIXNUL</TD> <TD ALIGN="LEFT" VALIGN="TOP" WIDTH=12>Number of pixels to set to zero at the edges of each order.</TD> </TR> <TR><TD ALIGN="LEFT">BKGxxx</TD> <TD ALIGN="LEFT" VALIGN="TOP" WIDTH=12>All background parameters : see definitions in Table <A HREF="node174.html#command-parameters-3">7.8</A>)</TD> </TR> <TR><TD ALIGN="LEFT">FFOPT</TD> <TD ALIGN="LEFT" VALIGN="TOP" WIDTH=12>Flat-Fielding option (<TT> YES/NO</TT>)</TD> </TR> <TR><TD ALIGN="LEFT">CORRECT</TD> <TD ALIGN="LEFT" VALIGN="TOP" WIDTH=12>Flat field correction image (required if <TT> FFOPT=YES</TT>).</TD> </TR> <TR><TD ALIGN="LEFT">BLAZE</TD> <TD ALIGN="LEFT" VALIGN="TOP" WIDTH=12>Smoothed flat field (required if <TT> FFOPT=YES</TT>).</TD> </TR> <TR><TD ALIGN="LEFT">EXTMTD</TD> <TD ALIGN="LEFT" VALIGN="TOP" WIDTH=12>(See definition in Table <A HREF="node174.html#command-parameters-2">7.7</A>)</TD> </TR> <TR><TD ALIGN="LEFT">SLIT</TD> <TD ALIGN="LEFT" VALIGN="TOP" WIDTH=12>(See definition in Table <A HREF="node174.html#command-parameters-2">7.7</A>)</TD> </TR> <TR><TD ALIGN="LEFT">OFFSET</TD> <TD ALIGN="LEFT" VALIGN="TOP" WIDTH=12>(See definition in Table <A HREF="node174.html#command-parameters-2">7.7</A>)</TD> </TR> <TR><TD ALIGN="LEFT">SAMPLE</TD> <TD ALIGN="LEFT" VALIGN="TOP" WIDTH=12>(See definition in Table <A HREF="node174.html#command-parameters-2">7.7</A>)</TD> </TR> <TR><TD ALIGN="CENTER" COLSPAN=2>Parameters: <TT> REDUCE</TT> command</TD> </TR> <TR><TH ALIGN="LEFT"><B>Parameter </B></TH> <TD ALIGN="LEFT" VALIGN="TOP" WIDTH=12><B>Description </B></TD> </TR> <TR><TD ALIGN="LEFT">BKGxxx</TD> <TD ALIGN="LEFT" VALIGN="TOP" WIDTH=12>All background parameters : see definitions in Table <A HREF="node174.html#command-parameters-3">7.8</A>)</TD> </TR> <TR><TD ALIGN="LEFT">FFOPT</TD> <TD ALIGN="LEFT" VALIGN="TOP" WIDTH=12>Flat-Fielding option (<TT> YES/NO</TT>)</TD> </TR> <TR><TD ALIGN="LEFT">CORRECT</TD> <TD ALIGN="LEFT" VALIGN="TOP" WIDTH=12>Flat field correction image (required if <TT> FFOPT=YES</TT>).</TD> </TR> <TR><TD ALIGN="LEFT">BLAZE</TD> <TD ALIGN="LEFT" VALIGN="TOP" WIDTH=12>Smoothed flat field (required if <TT> FFOPT=YES</TT>).</TD> </TR> <TR><TD ALIGN="LEFT">EXTMTD</TD> <TD ALIGN="LEFT" VALIGN="TOP" WIDTH=12>(See definition in Table <A HREF="node174.html#command-parameters-2">7.7</A>)</TD> </TR> <TR><TD ALIGN="LEFT">SLIT</TD> <TD ALIGN="LEFT" VALIGN="TOP" WIDTH=12>(See definition in Table <A HREF="node174.html#command-parameters-2">7.7</A>)</TD> </TR> <TR><TD ALIGN="LEFT">OFFSET</TD> <TD ALIGN="LEFT" VALIGN="TOP" WIDTH=12>(See definition in Table <A HREF="node174.html#command-parameters-2">7.7</A>)</TD> </TR> <TR><TD ALIGN="LEFT">SAMPLE</TD> <TD ALIGN="LEFT" VALIGN="TOP" WIDTH=12>(See definition in Table <A HREF="node174.html#command-parameters-2">7.7</A>)</TD> </TR> <TR><TD ALIGN="LEFT">RESPOPT</TD> <TD ALIGN="LEFT" VALIGN="TOP" WIDTH=12>Option for the response corection (<TT> YES/NO</TT>).</TD> </TR> <TR><TD ALIGN="LEFT">RESPMTD</TD> <TD ALIGN="LEFT" VALIGN="TOP" WIDTH=12>Method for the instrumental response correction (<TT> STD, IUE</TT>).</TD> </TR> <TR><TD ALIGN="LEFT">RESPONSE</TD> <TD ALIGN="LEFT" VALIGN="TOP" WIDTH=12>Name of the response image as produced by <TT> RESPONSE/ECHELLE</TT> (required if RESPMTD=STD).</TD> </TR> <TR><TD ALIGN="LEFT">RIPMTD</TD> <TD ALIGN="LEFT" VALIGN="TOP" WIDTH=12>Defines the ripple correction algorithm as <TT> SINC</TT> for the method fitting the blaze function, described by Ahmad(1981), and as <TT> OVER</TT> for the method using the overlapping region of the orders, proposed by Barker (1984) (required if <TT> RESPMTD=IUE</TT>).</TD> </TR> <TR><TD ALIGN="LEFT">RIPK</TD> <TD ALIGN="LEFT" VALIGN="TOP" WIDTH=12>Defines the initial guess for the parameter <I>k</I> in Equation <A HREF="node167.html#eq:echelle-10">7.5</A>. The default value is updated during the wavelength calibration.</TD> </TR> <TR><TD ALIGN="LEFT">ALPHA</TD> <TD ALIGN="LEFT" VALIGN="TOP" WIDTH=12>Defines the initial guess for the parameter <IMG WIDTH="44" HEIGHT="54" ALIGN="BOTTOM" BORDER="0" SRC="img335.gif" ALT="$\alpha$"> in Equation <A HREF="node167.html#eq:echelle-10">7.5</A>.</TD> </TR> <TR><TD ALIGN="LEFT">MGOPT</TD> <TD ALIGN="LEFT" VALIGN="TOP" WIDTH=12>Merging option (<TT> YES/NO</TT>).</TD> </TR> <TR><TD ALIGN="LEFT">MRGMTD</TD> <TD ALIGN="LEFT" VALIGN="TOP" WIDTH=12>Merging method (<TT> AVERAGE, NOAPPEND</TT>).</TD> </TR> <TR><TD ALIGN="LEFT">DELTA</TD> <TD ALIGN="LEFT" VALIGN="TOP" WIDTH=12>Interval (in wavelength units) to be skipped at the edges of each order.</TD> </TR> </TABLE></DIV> <A NAME="command-parameters-4"> </A></TD></TR> </TABLE> </DIV> <BR> <P> <HR> <!--Navigation Panel--> <A NAME="tex2html3588" HREF="node175.html"> <IMG WIDTH="37" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="next" SRC="icons.gif/next_motif.gif"></A> <A NAME="tex2html3585" HREF="node145.html"> <IMG WIDTH="26" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="up" SRC="icons.gif/up_motif.gif"></A> <A NAME="tex2html3581" HREF="node173.html"> <IMG WIDTH="63" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="previous" SRC="icons.gif/previous_motif.gif"></A> <A NAME="tex2html3587" 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="tex2html3589" HREF="node175.html">Bibliography</A> <B> Up:</B> <A NAME="tex2html3586" HREF="node145.html">Echelle Spectra</A> <B> Previous:</B> <A NAME="tex2html3582" HREF="node173.html">MIDAS Commands</A> <!--End of Navigation Panel--> <ADDRESS> <I>Petra Nass</I> <BR><I>1999-06-15</I> </ADDRESS> </BODY> </HTML>
