Inclinometry was done as follows :

    Datasets  El Dirn     HST     mean leg temperatures   Humidity
                          start     start   middle   end       %
 (  20040124  90  cw      14:21      0.6      1.1    1.4      90 
    20040205  90  cw      19:35      2.7      2.6    2.5     100 )
    20040215  90  cw      23:44      0.2     -0.1   -0.4      50

All data channels of the inclinometry data are OK. The resulting model is compared below with the previous useful one :

• The differences in (F1,F2,F3) between these two CW models are described by the rms scatters of (0.56", 0.18", 0.29") cf. (0.39", 0.33", 0.24") previously.
• The new CW model was merged with the (CW-CCW) template to create a hybrid track model, which was installed at HST 10:05 on 17 Feb 2004.
• Records of the symmetry and strain gauge data have been updated. The symmetry parameters seem to have increased steadily over the last few months, indicating a deterioration of this characteristic. The following plot shows these two parameters (the scatters in TY-vs-RY and in LY-vs-RY) plotted against the mean leg temperature at the mid point of the data acquisition (T):
  
  Click on image for better view

  There is a distinct trend (0.77 correlation) in the LY-vs-RY plot, reflecting, it is postulated, the thermal causes of the 'spikes' problem of 1997/8. The formal straight-line fits of the these data are

      TY-vs-RY =  -0.036 * T  + 0.92
                 +-   10          11
  
      LY-vs-RY =  -0.053 * T  + 1.70
                 +-   13          14
  
  

  One expects TY and RY to mimic each other despite temperature changes, and that the more interesting characteristic is the excess change in LY. It is important to conclude that there is no suggestion that the antenna is operating in or near the regime in which the 'spikes' problems of 1997/8 were prevalent.