Data set Overview
      =================
      On March, 2, 2004, the Rosetta spacecraft was launched towards
      comet 67P/Churyumov Gerasimenko. Since then the ROSNA sensor has
      been tested and optimized for flight during several
      commissioning slots. All data so far from DFMS and RTOF concern
      either the in flight calibration gas or back-ground outgassing
      from Rosetta.Because of several uploads of new voltage settings
      the data cannot be compared between the different commissioning
      slots, neither in intensity nor in mass scale! The data can be
      used only for engineering purposes. The only data which can be
      used to evaluate the background pressure of Rosetta are the COPS
      data. Scientific data from DFMS and RTOF will only be available
      when Rosetta reaches the first
      asteroid.
      The explanation of the generated data of the ROSINA sensors
      can be found in the OPERATION_LOGBOOK.ASC
 
      Parameters
      ==========
      DFMS and RTOF data contain neutral gas data as well as ion data.
      The data are raw, uncalibrated data. COPS contain pressure data
      of the background pressure and of some thruster firings from the
      nude gauge.
 
      Calibration
      ===========
      COPS data are calibrated. However, the calibration factor has
      been determined for Nitrogen gas, and may not be appropriate for
      the outgas-sing of Rosetta. Because the main outgassing
      component is unknown the correct factor to be used is also
      unknown.
      DFMS and RTOF data are uncalibrated and will remain uncalibrated
      because they have no scientific value.
 
      Note on the DFMS data:
      The user of our level 2 data has to make the conversion from
      pixel to mass and from ADC counts to ion current himself. In
      this way he will be aware that the precision is limited and
      depends on many parameters and he will use the data accordingly.
      The procedure required to calibrate the DFMS is described in our
      User manual, Annex D1 (DOCUMENT directory). ROSINA team are
      currently developing the necessary algorithms, putting emphasis
      on the quality control for the algorithm. They are defining
      quality flags for the data which will then tell the user how
      well the mass scale and the intensity scale have been defined.
      They are also working to produce level 3 data with calibrated
      mass scale and intensity. Once this SW is in place they will
      produce calibrated data for the Steins flyby with a suitable
      quality flag.
      It does not make sense and it is scientifically not correct if
      ROSINA team archive the Steins flyby data with 'calibrated'
      units without being sure that they are correct and without being
      able to give a uncertainty value.
 
      Processing
      ==========
      No processing was applied to the data.
 
      Coordinate Systems
      ==================
      The geometry items SC_SUN_POSITION_VECTOR,
      SC_TARGET_POSITION_VECTOR and SC_TARGET_VELOCITY_VECTOR provided
      in the label of the data product are relative to the Earth Mean
      Equator and Equinox reference frame of J2000.
      SUB_SPACECRAFT_LATITUDE, SUB_SPACECRAFT_LONGITUDE are given in
      the PLANETOCENTRIC coordinate system.
      These parameters are computed at time t=START_TIME.
      Distances are given in km, angles in degrees.
 
      Software
      ========
      No software is provided.
 
      Media/Format
      ============
      The standard distribution format for the data is an electronic
      volume.

Confidence Level Overview
      =========================
      N/A