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			       LI
               		    LINEINDEX
	  To calculate line indeces on spectral data.
  Line index is ratio of sum of data in specified band, to linearly
  interpolated contin level calculated in 2 adjacent bands.
	 Definitions :
	W    =	(AREA/CONTINUUM) mult by dispersion if appropriate
	CONTIN=	A * SUM1/NCHAN1	+ B * SUM2/NCHAN2
	A     = ( X2 - XB )/( X2 - X1 )
	B     = ( XB - X1 )/( X2 - X1 )
	X1    = mean channel of contin band 1
	X2    = "	"	"	"   2
	XB    = "	"	band of interest
	AREA  = SUMBAND - CONTIN*NBAND
	 Where band refers to band of interest.
	 Only one sideband need be specified.
    Bands may be specified in channels, or in bin-type 
    (converted tonearest integer channels).
	 AJP 25-JUL-81
	
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