Subtract scattered light from sky and object spectra. The routine measures the amount of (non-dispersed) scattered light contributing to the sky and object spectra by calculating the mean observed flux within spectral regions that have no sensitivity to dispersed light and subtracts that value from the entire sky and object spectra. This correction is not available for those detector/disperser combinations that do not contain a no-sensitivity region. The routine requires Table CCS9 containing the beginning and ending diode positions of the no-sensitivity regions for each detector/disperser combination.
