FOS Instrument Science Report 115 "Scattered Light in the G130H and G190H Modes of the HST Faint Object Spectograph" by T.R. Ayres Abstract excerpted from the report: Grating scattered light can be a significant problem for FOS spectroscopy of "red" celestial objects below 2000A. It can be quantified empirically through comparisons of G130H and G190H spectraof solar-type stars with templates based on irradiance scans of the Sun and IUE exposures of field G-type dwarfs. For more information, please contact the above authors.