The Mars Odyssey Gamma Ray Spectrometer (GRS) Summed Gamma Spectra (SGS) archive contains temporally and spatially binned Gamma Sensor Head (GSH) spectra generated from Corrected Gamma Spectra (CGS).

 
Citation Boynton, W.V., Mars 2001 Odyssey Gamma Ray Spectrometer Summed Gamma Spectra V1.0, ODY-M-GRS-5-SGS-V1.0, NASA Planetary Data System, 2003.
Digital Object Identifier (DOI) 10.17189/1519441
Data Set Abstract The ODY MARS GAMMA RAY SPECTROMETER 5 SGS (SGS) data set is a collection of data tables that contain a gamma spectrum and the associated engineering data that has been summed over 5-degree by 5-degree latitude longitude cells on the surface of Mars and over a time period of 15 degrees of solar longitude (Ls). The SGS are produced because the individual gamma spectra collected during an approximately 19.7 second collection interval do not contain enough counts to be statistically significant. The SGS are summed over large enough and long enough spatial and temporal intervals to provide a statistically meaningful spectrum that can be used for scientific data analysis.
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    Additional Information
    Mission Information 2001 MARS ODYSSEY
    Data Set Information ODY-M-GRS-5-SGS-V1.0
    Instrument Host Information ODY
    Instrument Information GRS
    Target Information MARS