Data Set Overview
      =================
      The archived data consist of count rates from the sum of two
      hemispherical detectors covering 4 pi steradians and
      operating continuously. The detectors are 3 mm thick CsI
      scintillators coupled to photomultiplier tubes. The nominal
      energy range is 25-150 keV, but the below table should
      be consulted to find the accurate thresholds for any day of
      the mission. A more complete description of the instrument may
      be found in [HURLEYETAL1992] and [COTINETAL1983]. Although the
      prime objectives of this investigation are the study of solar
      and cosmic x- and gamma-ray bursts, it should be noted that the
      experiment is also sensitive to solar protons and electrons.
      The former deposit energy directly in the scintillator if they
      are energetic enough, while the latter may produce x- radiation
      locally by bremsstrahlung. Thus although the counting rates are
      generally stable at about 500 c/s over the long term, there are
      periods of weeks to a month or so when the rates increase
      considerably due to particles. Examples may be found in March
      1991 (solar protons) and February 1992 (particles in the Jovian
      magnetosphere).  The time resolution of the data takes on one
      of four values depending on the telemetry rate and instrument
      operating mode: 0.25, 0.5, 1, or 2 seconds.

      YEAR  DAY  LOWER THRESHOLD  UPPER THRESHOLD KEV/CHANNEL
      1992    22    16.11          161.10           10.07
      1992    25    16.04          160.42           10.03
      1992    26    15.98          159.83            9.99
      1992    27    16.23          163.38           10.15
      1992    28    15.99          159.95           10.00
      1992    47    14.89          171.77           10.74
      1992    48    14.87          171.57           10.72
      1992    57    24.54          167.29           10.46

      Please note that this file has been converted to ASCII FORMAT
      (.TAB) files at PDS/PPI Node.

      The '.TAB' files contain the following columns:

        TIME     = spacecraft event time in the format
                   yyyy-mm-ddThh:mm:ss.sssZ
        HEADER   = Header information that is high 6 bits of binary
                   HEADER specification
        VERSION  = Version that is low order 2 bits of binary HEADER
                   specification
        SUBHEAD  = Subheader
        COUNTS   = Counts
        INT_TIME = Integration Time

      Parameters
      ==========
      INSTRUMENT OPERATING MODE FOR DATA FILES:

      file        mode        file        mode
      --------    --------    --------    -------
      T92025      A1          T92037      A2
      T92026      A1          T92038      A2
      T92027      A1          T92039      A1
      T92028      A1          T92040      A2
      T92029      A1          T92041      A1
      T92030      A1          T92042      A1
      T92031      A2          T92043      A1
      T92032      A2          T92044      A2
      T92033      A2          T92045      A2
      T92034      A2          T92046      A2
      T92035      A2          T92047      A2
      T92036      A2          T92048      A2

Confidence Level Overview
      =========================
      Data rate changes produce short spikes in the count rates due
      to a processing artifact. These can in principle be corrected
      if the data are scanned and the rate changes are identified;
      the count rate spikes can then be adjusted to their correct
      values. There are also short (one sample long) count rate
      dropouts, due to an artifact of the onboard software.