PDS_VERSION_ID                = PDS3
RECORD_TYPE                   = STREAM
OBJECT                        = TEXT
  PUBLICATION_DATE            = 2000-02-04
  NOTE                        = "Description of the Accelerometer data
     directory contents."
END_OBJECT                    = TEXT
END


     The MGS accelerometer data set contains raw accelerometer data.
The basic data product is spacecraft velocity change as a function of
time during aerobraking passes.  Each accelerometer data product
consists of four text files named COUNTS.TAB, ORBELEM.TAB,
RATEQUAT.TAB, and THRUSTER.TAB.  The detailed contents of these files
are described in the data product SIS found in the accelerometer
document directory and in the PDS catalog objects found in the CATALOG
directory.  The four files have attached PDS labels.

     An accelerometer data product contains data from a single
aerobraking orbit.  The data are organized into subdirectories based
on orbit.  Orbits are further collated into groups of 100 orbits.  An
example of the accelerometer directory and file organization is shown
below.

Directory/File             Description

ACC                        Top-level accelerometer data directory
|
|- P00XX                   Subdirectory for orbits 0-99
|  |
|  |- P0040                Subdirectory for orbit 40
|  |  |
|  |  |- COUNTS.TAB        Accelerometer data files
|  |  |- ORBELEM.TAB
|  |  |- RATEQUAT.TAB
|  |  |- THRUSTER.TAB