% @(#)calibrtwic.hlq	17.1.1.1 (ESO-IPG) 01/25/02 17:53:23
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%.COPYRIGHT  (c)  1993 European Southern Observatory
%.IDENT      calibrtwic.hlq
%.AUTHOR     11-JUN-93, IPG/ESO
%.KEYWORDS   MIDAS, help files, 
%.PURPOSE    On-line help file for the command: CALIBRATE/TWICE
%.VERSION    1.0  PB : Creation, 11-JUN-93
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SECTION./TWICE
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CALIBRATE/TWICE					   PB  11-JUN-93
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CALIBRATE/TWICE  
	Performs the wavelength calibration on a selected set of lines.
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Purpose:    
            Applies twice the wavelength calibration with CALIBRATE/LONG.
            A selection is performed in between, which retains for the
            second run only those lines which were identified in all rows.
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Syntax:     
            CALIBRATE/TWICE
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See also: 
            SELECT/LINE, CALIBRATE/LONG
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Note:       
            The second calibration is performed in mode GUESS. The first one 
            is saved in a session tmp.
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Examples:
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            CALIBRATE/TWICE
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