The results of fitting the TPOINT parameters CA and IE and their errors (dS,dZ) to recent datasets are quoted below :

    UT dates    Rx   No. of points     CA    dS      IE    dZ   Notes
   -----------  --   -------------   -----------   -----------  -----
   20061214      A        13         +1.7 +- 2.0   -0.8 +- 2.4
   20061218      A        12         -0.0 +- 2.7   -0.5 +- 2.8
   20061219-29   A        18         -3.9 +- 6.8   +0.8 +- 2.0

The collected data of UT 19th thru 29th Dec showed strong systematic trends of both dS and dZ with elevation/zenith-distance: trends not obviously seen in the data of UT 14th & 18th ! A full, 7-parameter fit reduced rms scatters in (dS,dZ) to (2.3",1.1"). The old (20061029) and new models are shown below:

              old             new
  IA       -261.96         -251.10    
  IE        -19.35          -23.15    
  NPAE      +22.26          +60.39     
  CA       -157.95         -195.07   
  AN         +8.36           +9.21   
  AW        -15.14          -15.34   
  TF         -4.26          -11.70    

The installation of such a model may follow.