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)  
51642.50   77908  345545  2678801   9160    31    49     118       0   0  0  0
51643.50   78333  345228  2670367   7708  2117  2124    1560       0   0  0  0
51644.50   78738  344864  2663024   6979  4650  4650    4024       0   0  0  0