version 2
Source: IERS Bulletin A (2000_2000_2)

Orbits: to be used with the IGS Rapid Service Orbits (IGR)

  MJD      Xpole   Ypole  UT1-UTC    LOD  Xsig  Ysig   UTsig  LODsig  Nr Nf Nt
             (10**-6")       (0.1 usec)    (10**-6")    (0.1 usec)  
51659.50   84614  339467  2499128   6780   103    54     181       0   0  0  0
51660.50   85714  339138  2492084   7309  2138  2123    1596       0   0  0  0
51661.50   86740  338742  2484116   8626  4650  4650    4024       0   0  0  0