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)  
51614.50   72350  358541  2925148  11252    48   115     138       0   0  0  0
51615.50   73712  358586  2914559   9927  2125  2160    1571       0   0  0  0
51616.50   74991  358577  2905022   9145  4650  4650    4024       0   0  0  0