PDS_VERSION_ID        = PDS3
RECORD_TYPE           = STREAM
OBJECT                = TEXT
  INTERCHANGE_FORMAT    = ASCII
  PUBLICATION_DATE      = 2007-09-08
  NOTE                  = "Description of contents of CALIB directory"
END_OBJECT            = TEXT
END

       The CALIB directory contains a brief description of the files
       within the directory (this file), the topocentric reference
       frame definition kernel for DSN stations,
       the Structures Kernel, Leapsecond kernel files,
       and Spacecraft Clock Conversion files . All files in  the CALIB
       directory are ASCII text files with variable length records
       delimited by ASCII carriage-return line-feed pairs. All file
       names in this directory contain the string 'yymmdd', where yy,
       mm, dd indicate the year, month, and day respectively of the
       file creation.

       If a file was not used during collection of the data in this
       volume or if there was no expectation that the file would be
       needed during processing of the data, the file is not included
       in the CALIB directory.

       The topocentric reference definition kernel defines topocentric
       reference frames associated with each of the DSN stations.
       File names are of the form:

       earth_topo_yymmdd.tf

       Each file earth_topo_yymmdd.tf is accompanied by a PDS detached
       minimal label with name earth_topo_yymmdd.LBL.

       The MRO Structures SPK file contains location of various MRO
       structures and science and engineering instruments. File names
       are of the form:

       MRO_yymmdd.STK

       Each file MRO_yymmdd.STK is accompanied by a PDS detached
       minimal label with name MRO_yymmdd.LBL.

       Leapsecond kernel files are a record of leap seconds
       (past and predicted) that allow proper conversion between
       ephemeris time and UTC. File names are of the form:

                  LSK_yymmdd.TLS

       Each file LSK_yymmdd.TLS is accompanied by a PDS detached
       minimal label with name LSK_yymmdd.LBL.

       Spacecraft Clock Conversion files allow time measured by the
       Spacecraft clock to be converted to other time systems (e.g.,
       ephemeris time or UTC). File names are of the form:

                 TSC_yymmdd.CLK

       Each file TSC_yymmdd.CLK is accompanied by a PDS detached
       minimal label with name TSC_yymmdd.LBL.