INTERNATIONAL EARTH ROTATION SERVICE


                          EOP(IERS) C 02

         Combined series of EOP (normal points) at 5-day intervals


  	This series are available from 1970 in the 1997 IERS system. It is 
    regularly recomputed to take advantage on one hand of the improvement 
    of the various individual contributions and in the other hand of the 
    refinement of the analyses procedure. 
    For each date at 5-day intervals, individual determinations available
    within +/- 2.5 days are brought to the central date by a modeled time 
    variation of each of the EOP. The combined normal values are obtained 
    by a weighted least square adjustment taking into account the 
    covariance matrices of the individual determinations. The a priori 
    standard deviations are based on the formal uncertainties associated 
    with the individual values of the EOP, scaled to match the pair variance 
    of the series, with added variances.
    (See 1996 IERS Annual Report p II-61 ).

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

  FORMAT OF THE FILES :

  Field

   First line
    1   I6          numerical code of the series
    2   F10.3       MJD of the measure
    3   F10.6       x coordinate of the pole (")
    4   F10.6       y coordinate of the pole (")
    5   F11.7       UT1 - UTC (s)
    6   F11.7       duration of the day D (s)
    7   F10.6       dPsi celestial pole offsets in longitude (")
    8   F10.6       dEPsi celestial pole offsets in obliquity (")
   Second line
    9   F10.6       standard error on x coordinate of the pole (")
   10   F10.6       standard error on y coordinate of the pole (")
   11   F11.7       standard error on UT1 - UTC (s)
   12   F11.7       standard error on duration of the day D (s)
   13   F10.6       standard error on dPsi celestial pole offsets in longitude (")
   14   F10.6       standard error on dEPsi celestial pole offsets in obliquity (")