Inclinometry was done as follows :

    Datasets  El Dirn     HST     mean leg temperatures   Humidity
                          start     start   middle   end       %
  ( 20041127  90  cw      10:28      4.5      5.5    6.5      50 )
    20041211  90  cw      10:19      4.0      5.2    6.0      25

All data channels look OK; the difference between the model resulting from the new data and the current one (of 27 Nov) is shown below:

• The differences in (F1,F2,F3) in the latter case are described by rms scatters of (0.84", 0.67", 0.55") c.f. (0.37", 0.25", 0.62") previously, but the difference is dominated more by the systematic, quadrant-wide, 2"- to 3"-amplitude level changes - a characteristic not seen before.
• The new CW model was merged with the (CW-CCW) template to create a new hybrid track model, which was installed at HST 10:40 on 13 December 2004. The -2" spike in the F1 component of the track model at azimuth 142 degs was interpolated out - although it is noteworthy that it occurred precisely at one of the wheel-track joint locations.
• The symmetry and the wheel-loading - as judged from strain gauge No.2 only - show nothing amiss.

The quadrant-wide systematic seeems to be the only characteristic to have changed since last time, but it is severe enough to warrant a prompt repeat.