MEX SCLK Files
  ==============

  This "aareadme.txt" file describes the contents of the kernels/sclk
  directory of the MEX SPICE data server. It also provides the file naming
  conventions used for the MEX SCLK kernels, and it provides identification
  of the most current version of SCLK files.

  SCLK files are created from the information contained in the ESOC's DDID
  Time Correlation Packets, by the ADCS system located at ESAC.

  The most detailed description of the data in an SCLK file is provided in
  metadata included inside the description area of the file. This information
  can be viewed using any text editor program.

  At least a basic knowledge of the SPICE system is needed in order to use
  this kernel. The SPICE toolkit provides versions in Fortran (SPICELIB), C
  (CSPICE), IDL (icy) and Matlab (mice), and the user can choose any one that
  suits him/her.

  The SPICELIB routine FURNSH, CSPICE function furnsh_c, and icy and mice
  routine cspice_furnsh load a kernel file into the kernel pool as shown
  below.

      CALL FURNSH ( 'kernel_name' )
      furnsh_c    ( "kernel_name" );
      cspice_furnsh, 'kernel_name'
      cspice_furnsh( 'kernel_name' )

  In the case when two or more files contain data overlapping in time for a
  given object, for binary kernels, the file loaded last takes precedence.

  If two (or more) text kernels assign value(s) using the '=' operator to
  identical keywords, the data value(s) associated with the last loaded
  occurrence of the keyword are used -all earlier values have been replaced
  with the last loaded value(s).

  All SCLK files (*.TSC) contained in this directory are unix text files.
  These may be used in a non-compatible text environment by using the ASCII
  mode of FTP to port the files.

  Contact

      ESA SPICE Team             spice@sciops.esa.int

  , or

      Alfredo Escalante Lopez    aescalante@sciops.esa.int

  if you have any questions.


  References
  ==========

    1. Data Delivery Interface Document (DDID)   Issue C1 (MEX-ESC-IF-5003)
       1 July 2005

    2. SCLK Required Reading (NAIF Document).

    All the NAIF Documents are available at the NAIF web:

      http://naif.jpl.nasa.gov


  Mars Express SCLK Directory Structure
  =====================================

     aareadme.txt         Text file describing the directory structure, the
                          naming conventions for the SCLKs, and the current
                          version(s) of each SCLK type.

     former_versions      Subdirectory that contains obsolete versions of the
                          SCLK files that have been updated in the Current
                          SCLK Kernels Set, and fake SCLK files used before
                          the creation of real ones.

     MEX_YYMMDD_STEP.TSC  SPICE Kernel (SCLK) that contains information
                          required for Mars Express spacecraft on-board
                          clock to UTC conversion. This file provides
                          the same time information that the Time
                          Correlation packets released via Data
                          Distribution System, with the exception of
                          60 seconds before the starting time of each
                          packet, during which the clock rate was
                          sightly adjusted to make the correlation
                          function continuous. This file was released
                          on YY-MM-DD.


-------------------

        This file was last modified on March 22th, 2021. (R. Valles)


End of aareadme file.