Data Set Overview:NEAR EDR volume sets contain a single data set, from one instrumentand one mission phase (defined in the phase table in /AAREADME.TXT). The first volume of the set is a documentation-only volume and containsCALIB, GEOMETRY and other non-data subdirectories. The INDEX directoryon the first volume contains the summary of all the volumes. The DOCUMENTdirectory on the first volume contains non-changing documentation.Subsequent volumes contain only BROWSE, CATALOG, DATA, and INDEXsubdirectories in order to minimize duplication. The data volumes alsocontain a DOCUMENT directory, which contains information related to thecalibration of the data files on that volume.  Directory/Product Description:------------------------------All images and image products described below are 537 x 244rectangular pixels where the rectangular pixel dimensions are162 x 96 microradians. RAW: Raw images. Image in this directory are units of raw DN, asreceived from the spacecraft after data were uncompressed. No editingof the data has taken place. Missing transfer frames are representedas null pixels. RAD: Radiance images. Images in this directory have been calibratedto units of radiance using the following procedure. Dark current wasremoved using a model based on position in the image, mission-elapsedtime, exposure time, and CCD temperature. Frame transfer smear wasremoved using the procedure described in MSICAL.TXT. The image wasthen divided by the flat-field image corresponding to the filterthrough which the image was taken. To convert from these units of'corrected DN' to radiance, the image was divided by its exposuretime, a calibration coefficient (which converts from DNs/time toradiance) for that filter, and the temperature dependence of thecalibration coefficient as described in MSICAL.TXT. CRD: Cleaned radiance images. Images in this directory have beencalibrated to units of radiance using the following procedure. Darkcurrent, background frame transfer smear, and background leaked lightwere removed using the nominal image and one taken with a 0-msexposure within several seconds, through the same filter. The 0-msexposure has a slightly different dark current but the same frametransfer smear and leaked light. Dark current was removed separatelyfrom the two images, using a model based on position in the image,mission-elapsed time, exposure time, and CCD temperature. Thedark-corrected 0-ms image was subtracted from the dark-correctednominal image. The difference image was then divided by theflat- field image corresponding to the filter through which theimage was taken. To convert from these units of 'corrected DN' toto radiance, the image was divided by its exposure time, acalibration coefficient (which converts from DNs/time to radiance)for that filter, and the temperature dependence of the calibrationcoefficient as described in MSICAL.TXT. CRDDBL: Cleaned, deblurred radiance images. Images in this directoryhave been calibrated to units of radiance beginning with theprocedure described for cleaned radiance images (CRD). In addition,images were 'deblurred' by application of a Fourier filteringrestoration of a degraded image point-spread function, as describedin MSICAL.TXT. IOF: I/F images. Images in this directory have been calibrated tounits of I/F beginning with the procedure described for radianceimages (RAD). The images were subsequently divided by pi times thesolar irradiance expected at the target body's distance from the Sun. IOFDBL: Deblurred I/F images. Images in this directory have beencalibrated to units of I/F beginning with the procedure describedfor I/F images (IOF). In addition, images were 'deblurred' byapplication of a Fourier filtering resotration of a degreded imagepoint-spread funcition, as described in MSICAL.TXT CIF: Cleaned I/F images. Images in this directory have beencalibrated to units of I/F beginning with the procedure describedfor cleaned radiance images (CRD). The images were subsequentlydivided by pi times the solar irradiance expected at the targetbody's distance from the Sun. CIFDBL: Cleaned, deblurred I/F images. Images in this directoryhave been calibrated to units of radiance beginning with theprocedure described for cleaned I/F images (CIF). In addition,images were 'deblurred' by application of a Fourier filteringrestoration of a degraded image point-spread function, as describedin MSICAL.TXT. ------------------------------------------------------ Parameters:The definitions for the image parameters and other keywords are givenin the file MSIDEFINITIONS.TXT contained in the DOCUMENT/INSTRUMENTsubdirectory. Data:The data are in the form of FITS files with attached FITSheaders and detached PDS labels. Data files contain one imageper file. Ancillary Data:Geometry and CALIB subdirectories are described above. Media/Format:This data set is released as a CDROM set. Processing History:The processing history includes no background, noise, geometryor other corrections.

Data Quality Flag:Each data file label includes a quality flag string in thedata_qualITY_ID keyword, extracted from the FITS keyword near-008 ofthe original data label. The fields of this keyword are defined below.Data quality defects flag is raised when there is missing data otherfields informational and not quality related. The eight characters ofthis field are described below. Definition - Data Quality Index  c0 : Data Quality Flag (0:good,1:flagged for quality defects)  c1 : Instrument Number for FC, CTP and AIU (1 or 2)  c2 - c6 : Processing Flags not quality related  c7 : CCDS Source (0:VC0, 1:VC1, 2:VC2, 3:VC3)  Review:This data set was currently undergoing external peer review withinPDS in July, 2001.