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)  
51643.50   78045  344804  2670131   7974    34    72     133       0   0  0  0
51644.50   78265  344124  2662598   7093  2115  2138    1563       0   0  0  0
51645.50   78534  343480  2655578   6946  4650  4650    4024       0   0  0  0