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)  
51667.50   90189  336407  2410112  14710    24    55      75       0   0  0  0
51668.50   90489  336013  2396089  13337  2109  2128    1538       0   0  0  0
51669.50   90751  335546  2383692  11456  4650  4650    4024       0   0  0  0