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)  
51615.50   73589  358410  2914517   9955    35   135     157       0   0  0  0
51616.50   74781  358353  2905075   8928  2118  2171    1582       0   0  0  0
51617.50   75895  358247  2896275   8673  4650  4650    4024       0   0  0  0