GRS_SPEFF makes preliminary GRS-1 and 2 spectra (0.3 - 100
MeV).You interactively choose the flare and background time intervals
for the spectral analysis. The flux of each channel is calculated by
dividing the counts by full energy absorption efficiency. The first three
channels data of GRS-1 and the four channels of data of GRS-2 are not plotted
because these channel widths are not exactly determined.
IDL> grs_speff,data,index,ph=1,/disp
IDL> grs_speff,data,index,ph=2,/disp
IDL> grs_speff,data,index,ph=1,fltime=fltime,bgtime=bgtime