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)  
51617.50   74747  357680  2896515   8348    92    42     109       0   0  0  0
51618.50   75103  357265  2887996   8691  2147  2114    1548       0   0  0  0
51619.50   75482  356844  2878713   9875  4650  4650    4024       0   0  0  0