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)  
51619.50   74815  355756  2879904   9049   126    73     126       0   0  0  0
51620.50   74809  354848  2870167  10424  2166  2140    1560       0   0  0  0
51621.50   74870  354022  2858923  12065  4650  4650    4024       0   0  0  0