% @(#)selectback.hlq	17.1.1.1 (ESO-IPG) 01/25/02 17:50:39 
%++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
%.COPYRIGHT  (c)  1990 European Southern Observatory
%.IDENT      selectback.hlq
%.AUTHOR     PB, IPG/ESO
%.KEYWORDS   MIDAS, help files, SELECT/BACKGROUND
%.PURPOSE    On-line help file for the command: SELECT/BACKGROUND
%.VERSION    1.0  03-MAR-1991 : Creation, PB
%----------------------------------------------------------------
\noparameters
\se
SECTION./BACK
\es\co
SELECT/BACKGROUND						03-MAR-1991 PB
\oc\su
SELECT/BACKGROUND   [all] 
	interactive unselection of background reference positions
\us\pu
Purpose:    
            Enables to unselect interactively reference positions from
            table ORDER before background estimate. The background will
            be interpolated between selected positions.
\up\sy
Syntax:     
            SELECT/BACKGROUND  [all]
\ys\pa
            all   =   Enables to start with all positions selected (all=ALL)
                      Default is NULL: start with last selected positions.
\ap\no
Note:       
            none
\on\exs
Examples:
\ex
\\{\tt
            SELECT/BACKGROUND   ALL\\
            SELECT/BACKGROUND   
\\}
\xe \sxe