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)  
51666.50   89935  336829  2425312  14909    32    42      58       0   0  0  0
51667.50   90534  336596  2410680  14355  2114  2117    1517       0   0  0  0
51668.50   91070  336282  2397017  12970  4650  4650    4024       0   0  0  0