Inclinometry was done as follows :

    Datasets  El Dirn     HST     mean leg temperatures   Humidity
                          start     start   middle   end       %
  ( 20040310  90  cw      15:30      0.6      1.3    1.6      80 
    20040313  90  cw      11:50      1.5      2.1    2.7     100 )
    20040322  90  cw      00:08     -0.8     -0.6   -0.5      80
    20040322  90 ccw      03:08     -0.4     -0.2    0.0      80

All data channels of the inclinometry data look OK. The resulting CW model is compared below with the current one - that taken on 10 Mar :

• The result shows no significant changes - but, as last time, there are small F3 systematics at the start indicating that the run on the 10th was started too early - before the inclinometer in the cabin had settled.
• The new CW model was merged with the (CW-CCW) template to create a new hybrid track model, which was installed at HST 16:10 on 22 Mar 2004.
• The differences in (F1,F2,F3) between these two CW models are described by the rms scatters of (0.49", 0.18", 0.31") cf (0.28", 0.16", 0.33"); previously.
• The new CCW data are the first of the year. The CW-CCW difference is shown below :
  

  and (apart from 'settling' issues at the start of the CCW run) is similar to the (CW-CCW) template derived from 2003 data.

• Records of the symmetry and strain gauge data have been updated; all looks fine.