% @(#)identilong.hlq	17.1.1.1 (ESO-IPG) 01/25/02 17:53:24
%++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
%.COPYRIGHT  (c)  1993 European Southern Observatory
%.IDENT      identilong.hlq
%.AUTHOR     23-MAR-93, IPG/ESO
%.KEYWORDS   MIDAS, help files, 
%.PURPOSE    On-line help file for the command: IDENTIFY/LONG
%.VERSION    1.0  PB : Creation, 23-MAR-93
%----------------------------------------------------------------
\se
SECTION./LONG
\es\co
IDENTIFY/LONG					   PB  23-MAR-93
\oc\su
IDENTIFY/LONG  [wlc]  [ystart]  [lintab]  [tol]
	Interactive calibration of lines in an arc spectrum
\us\pu
Purpose:    
            Plots a row of the arc spectrum and invokes command 
            GET/GCURSOR for intercative identification of lines.
\up\sy
Syntax:     
            IDENT/LONG [wlc] [ystart] [lintab] [tol]
\ys\pa
            wlc    = Wavelength calibration frame
                     Session keyword : WLC; no default value
\ap\pa
            ystart = Starting row number (pixels) for identification
                     and calibration.
                     Session keyword : YSTART; default : 0
\ap\pa
            lintab = Line table, as generated by command SEARCH/LONG
                     Session keyword : LINTAB; default : line.tbl
\ap\pa
            tol    = Tolerance for the identification of lines, in
                     world coordinates. This parameter must be set
                     if the interactive pointing generates too often
                     the error message: "Feature not found, try again..."
                     (No session keywords controls this parameter)
                     Default: 4.
\ap\sa
See also: 
            SEARCH/LONG, GRAPH/LONG, CALIBRATE/LONG, CUTS, SET/GRAPH,
            ESTIMATE/DISPERSION
\as\no
Note:       1) This command requires two preliminary actions:\\
               - Creation of a line table with SEARCH/LONG\\
               - Creation of a graphic window with GRAPH/LONG

            2) If YSTART=0, its value is automatically set to the 
               central row number.

            3) The arc spectrum is plotted with respect to the current
               set-up of plotting parameters. To adjust the plotting,
               use commands CUTS or SET/GRAPH.

            4) Interactive identification of lines can be avoided by
               the command ESTIMATE/DISPERSION. This command is however
               provided on an experimental basis.
\on\exs
Examples:
\ex
            IDENT/LONG  ystart=200
\xe \sxe