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)  
51623.50   73645  352745  2841536  10329   107    74     127       0   0  0  0
51624.50   73521  351916  2831455   9835  2152  2138    1568       0   0  0  0
51625.50   73479  351165  2821856   9362  4650  4650    4024       0   0  0  0