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)  
51645.50   79688  343289  2654128   7941    35    48      67       0   0  0  0
51646.50   81062  342680  2645930   8455  2118  2120    1535       0   0  0  0
51647.50   82359  342067  2637094   9216  4650  4650    4024       0   0  0  0