contains EVENTS table and exposure maps true contains SRCLIST table and selection regions true generate a source spectrum background correct the spectrum source spectrum filename true generate a background spectrum background spectrum filename true id of source to extract source in [0:] reflection order to extract order in [1:] dispersion channel rebinning factor rebin in [1:] number of bad channels at chip edges edgechannels in [0:] add FRAC_EXP column to output files minimum good fractional exposure exposed in [0:1] QUALITY used to flag bad channels badquality in [0:5] Dispersion binning method