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)  
51618.50   74906  356723  2888292   8380   135    75     148       0   0  0  0
51619.50   75147  355863  2879411   9381  2163  2138    1575       0   0  0  0
51620.50   75433  355080  2869203  11037  4650  4650    4024       0   0  0  0