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)  
51686.50   94720  325323  2219322   5147    41    51     100       0   0  0  0
51687.50   95027  324800  2214060   5376  2122  2127    1551       0   0  0  0
51688.50   95275  324197  2208306   6132  4650  4650    4024       0   0  0  0