Data set Overview
      =================
      The CODMAC level 5 science data consist in time series (local
      density) covering the Prelanding phase for the major species
      H2O, CO, O2, and CO2.
      Rosetta was at distances between 4.5e6 km and 9.2km from the
      comet during this time.
      ROSINA was permanently analysing the coma of the comet with the
      DFMS and COPS sensors, and part of the time with the RTOF sensor
      (instrument performance permitting), except during wheel
      offloadings, when the mass spectrometers DFMS and RTOF were in
      standby, and during orbit control manoeuvres, when all sensors
      were off. Explanations on the data generation 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 data contains nude
      gauge pressure values of the combined spacecraft and cometary
      signal. For calibrated data we refer the user to the level 3
      data.
 
      Calibration
      ===========
      The level 5 data products are based on the COPS L2 PDS, DFMS L3
      PDS, and RTOF L3 PDS calibrated products.
 
      Processing
      ==========
      The processing of the RTOF and DFMS CODMAC L3 to L5 PDS derived
      data is detailed in the ROSINA_PDS_L3_TO_L5.PDF document.
 
      Software
      ========
      No software will be provided.
 
      Media/Format
      ============
      The standard distribution format for the data is an electronic
      volume.
 
      Coordinate System
      =================
      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 Cheops reference frame.
      The SPACECRAFT_ALTITUDE gives the distance to the spacecraft
      from the target center of mass. These parameters are computed at
      time t=START_TIME.
      Distances are given in km, angles in degrees.
 
      Cheops Reference Frame
      ======================
      Scholten, F., Preusker, F., Jorda, L, and Hviid, S.,
      Reference Frames and Mapping Schemes of Comet 67P/C-G,
      RO-C-MULTI-5-67P-SHAPE-V1.0:CHEOPS_REF_FRAME_V1,
      NASA Planetary Data System and ESA Planetary Science Archive,
      2015.

Confidence Level Overview
      =========================
      All data have been validated by the ROSINA team and found as
      expected. Any exceptions are noted by the DATA_QUALITY field in
      the label files.