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)  
51616.50   74386  358109  2904804   9048    99    90     114       0   0  0  0
51617.50   75209  357850  2895964   8632  2151  2132    1555       0   0  0  0
51618.50   75971  357559  2887114   9069  4650  4650    4024       0   0  0  0