Required Reading
  ================
    The format of all VIRTIS data are described in detail by the EAICD
    document located in the /DOCUMENT directory. VIRTIS team strongly
    recommends reading this documentation before using the data.

  Data Set history
  ================

    This data set is version V2.0. The changes from the V1.0 enclose the
    closure of the liens from the 2017 review:
      - updates of documents such as EAICD, M and H calibration.
      - updates of AAREADME, ERRATA and DATASET.CAT
      - Updates of the data as the team found a bug in the calibration
      pipeline.

  Data Set Overview
  =================
    This data set contains cal data acquired by the Rosetta
    Orbiter VIRTIS spectrometer during the PRELANDING MTP004 of the
    Rosetta mission.


  Processing
  ==========
    The data in this data set are cal, CODMAC Level 3 data. Only the
    calibration algorithm has been applied to the data.



  Data
  ====
    The data are in PDS format. A detailed description of
    the data format is given in the VIRTIS EAICD
    document located in the DOCUMENT directory of this data set.


  Ancillary Data
  ==============
    No ancillary data included in this data set.


  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 frame of J2000.

      SUB_SPACECRAFT_LATITUDE, SUB_SPACECRAFT_LONGITUDE are
      given in the PLANETOCENTRIC coordinate system. These parameters
      are corrected by planetary and stellar aberrations.
      Distances are given in km, angles in degrees.


  Software
  ========
    The data can be accessed with the software IDL routines
    provided and documented in the EXTRAS directory.

Confidence Level Overview
  =========================
    Data confidence is nominal, meaning that for all data have been
    validated by the VIRTIS team and found as expected. Any exceptions
    are noted by the DATA_QUALITY field in the label files.


  Review
  =====
    This data set have undergone an external review in Autumn 2017.



  Data Coverage and Quality
  =========================
    Data quality is good unless otherwise noted by the DATA_QUALITY
    keyword.


  Limitations
  ===========
    No limitations on these data