_____________________________________________________________________ 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 ______________________________________________________________________