Data Set Overview and Parameters : The GRS Level 2 data products in this archive include dailytime series of spectra collected by the instrument along withselected spacecraft engineering and instrument configuration andorbital ephemerides. Supporting documentation includes as to thespecifics of how these data were generated. Selected ephemeridesand engineering parameters are averaged for the composite set ofinformation.  Processing : The Level 2 data products comprise the time series of the GRSinstrument's science data in physical units. At each integrationtime the instrument Data Processing Unit (DPU) samples instrumentspectra accumulated during the integration period as well asinstrument and engineering configuration information. Groundprocessing activities at the University of Arizona produce DerivedEngineering and Spatial Ephemerides information. The Level-2 dataare then combined into integral products within a relationaldatabase and exported as an integral Level-2 product. Each GRS recordis comprised of the following logical data units:  Spectra: 5, (1024 Channel) Spectra (NAI, BGO, ANTI, NAI1, NAI2, BGO1, BGO2) NAI : Sodium Iodide: Asteroid Pointing BGO : Bismuth Germanate: Asteroid Pointing ANTI: Anti-Coincidence: Asteroid Pointing NAI1: Sod. Iod 1 Escape: Asteroid Pointing NAI2: Sod. Iod 2 Escape: Asteroid Pointing 2, (21 Channel) Spectra BGO1: Bis. Germ. 1 Escpe:Asteroid Pointing BGO2: Bis. Germ. 2 Escpe:Asteroid Pointing Instrument HouseKeeping: Instrument Rates and activity Engineering Housekeeping: Engineering Configurations (volts, etc.) Derived Engineering: Ground derived data products Spatial Orbital Ephemerides  Data and Ancillary Files : Files for Level-2 are organized into a series of time subdirectories.   Coordinate System : All products were derived in the Asteroid Body Fixed Coordinate System  Software : These products were derived from a specialized ground processing system developed at the University of Arizona Lunar and Planetary Laboratory. All derived products are described in the DOCUMENT Section of this volume:  Requirement Specifications For Level-2 Parameters Required Stored or Derived by The Near Earth Asteroid Rendezvous (NEAR) Gamma-Ray Spectrometer (GRS) Ground System  Media : CD-ROM

Overview : Data in this archive have been reduced as part of mission data analysis activities of the NEAR XGRS Science Team. Data of questionable validity have been omitted from the solutions.   Review : This archival data set was reviewed by the NEAR XGRS Team prior to submission to the Planetary Data System (PDS). It was one of several data sets included in a comprehensive review by the PDS Small Bodies Node in August 2001, prior to PDS acceptance and ingestion.   Data Coverage and Quality : The data included in this archive were collected during the NEAR orbital phase from 2000-02-14 to 2001-02-12.   Limitations : None