OBJECT        = COLUMN
   NAME           = MET
   COLUMN_NUMBER  = 1
   BYTES          = 4
   DATA_TYPE      = MSB_UNSIGNED_INTEGER
   START_BYTE     = 1
   DESCRIPTION = "Mission elapsed time, in seconds, corresponding to the 
    start of the accumulation period for the spectra."
END_OBJECT            = COLUMN  

OBJECT        = COLUMN
   NAME           = ACCUM_TIME
   COLUMN_NUMBER  = 2
   BYTES          = 4
   DATA_TYPE      = MSB_UNSIGNED_INTEGER
   START_BYTE     = 5
   DESCRIPTION = "Accumulation time, in seconds, of the HPGe detector."
END_OBJECT    = COLUMN

OBJECT        = COLUMN
   NAME           = MIDPOINT_MET
   COLUMN_NUMBER  = 3
   BYTES          = 4
   DATA_TYPE      = MSB_UNSIGNED_INTEGER
   START_BYTE     = 9
   DESCRIPTION = "The mission elapsed time at the midpoint of the 
   observation. Defined as:
   MET at the start of the observation +  (ACCUM_TIME / 2)."
END_OBJECT    = COLUMN

OBJECT        = COLUMN
   NAME           = ORBIT_NUMBER
   COLUMN_NUMBER  = 4
   BYTES          = 2
   DATA_TYPE      = MSB_UNSIGNED_INTEGER
   START_BYTE     = 13
   DESCRIPTION    = "Orbit number is a unique identifier for a given orbit of
   the MESSENGER spacecraft around Mercury. Orbit number is defined as
   starting at apoherm and is calculated using the MET value and the
   appropriate SPICE kernels. Orbit numbering does not start until MESSENGER
   performs the Mercury orbit insertion. Until that time the value for orbit
   number is 0."
END_OBJECT    = COLUMN

OBJECT        = COLUMN
   NAME           = START_BIN
   COLUMN_NUMBER  = 5
   BYTES          = 2
   DATA_TYPE      = MSB_UNSIGNED_INTEGER
   START_BYTE     = 15
   DESCRIPTION = "Start Bin of the Shield detector."
END_OBJECT    = COLUMN

OBJECT        = COLUMN
   NAME           = NUMBER_OF_BINS
   COLUMN_NUMBER  = 6
   BYTES          = 2
   DATA_TYPE      = MSB_UNSIGNED_INTEGER
   START_BYTE     = 17
   DESCRIPTION = "Number of bins in the raw spectra."
END_OBJECT    = COLUMN

OBJECT        = COLUMN
   NAME           = GRS_PRIORITY_LEVEL
   COLUMN_NUMBER  = 7
   BYTES          = 2
   DATA_TYPE      = MSB_UNSIGNED_INTEGER
   START_BYTE     = 19
   DESCRIPTION = "Indicates the type of priority assigned to the science
   packet. The priority level is tied to the ApID of the packet. Priority
   level varies from 0-3, 0 being highest and 3 being lowest priority."
END_OBJECT    = COLUMN

OBJECT        = COLUMN
   NAME           = BAD_DATA_FLAG
   COLUMN_NUMBER  = 8
   BYTES          = 2
   DATA_TYPE      = MSB_UNSIGNED_INTEGER
   START_BYTE     = 21
   DESCRIPTION = "Intended for use as a bit-string bad data flag to indicate
   specific problems associated with the data. Values are expected to be 
   assigned to specific bits as problems are identified during the course of
   the mission. Currently no values have been assigned and will default to a
   value of zero."
END_OBJECT    = COLUMN

OBJECT        = COLUMN
   NAME           = SHIELD
   COLUMN_NUMBER  = 9
   BYTES          = 2048
   DATA_TYPE      = MSB_UNSIGNED_INTEGER
   START_BYTE     = 23
   ITEMS          = 1024
   ITEM_BYTES     = 2
   DESCRIPTION    = "Spectra of light pulses produced from interaction of a
   gamma ray with the plastic scintillator shield. Contains the counts in each
   of the 1024 bins after 1 accumulation period."
END_OBJECT    = COLUMN