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)  
51658.50   83562  339804  2505684   7133   189    79     167       0   0  0  0
51659.50   84054  339105  2498534   7166  2183  2130    1589       0   0  0  0
51660.50   84507  338386  2490977   7949  4650  4650    4024       0   0  0  0