Thermal  - Recall : mean_temp_slope was adjusted to 0.4"/deg on 01 Dec.
-------    Analysis split before & after model update on 15 Dec :
                                                                  
           Dates  FE  No.   fit                              Temp range
           -----  --  ---  ----------------------------     -----------
           01-15   S  107  del = (-1.0  +- 0.5 )*T_diff     -0.5 to 2
                               = (-0.11 +- 0.10)*T_mean        1 to 10
           16-28   S  110  del = (-1.5  +- 0.6 )*T_diff     -0.5 to 1.5
                               = (-0.27 +- 0.08)*T_mean **     2 to 12
           01-15   A   53  del = ( 0.2  +- 0.9 )*T_diff     -0.5 to 1.5
                               = ( 0.33 +- 0.16)*T_mean        0 to 8
           16-28   A   80  del = (-1.3  +- 0.9 )*T_diff     -0.5 to 2
                               = (-0.24 +- 0.16)*T_mean        2 to 12
           01-15   B   74  del = (-0.7  +- 0.7 )*T_diff     -0.5 to 1.5
                               = (+0.31 +- 0.15)*T_mean        1 to 9
           16-28   B   24  del = (-4.7  +- 1.8 )*T_diff     -0.5 to 0.5
                               = (+0.55 +- 0.68)*T_mean        5 to 10
           01-15   W   40  del = (-1.5  +- 1.7 )*T_diff     -0.5 to 1
                               = (+0.66 +- 0.35)*T_mean        1 to 7
           16-28   W    4  no fits made
                                                                  
** marks significant ( >3sigma) relationships.
Nothing significant and consistent across FEs.

Focus
-----              
      FE  axis  No.obs.    mean   s.d.  Notes ('significant' trends)
                           (mm)   (mm)
                                                                        
    SCUBA   Z      88     -0.09   0.08    1,2
            X      33     +0.03   0.16    3
            Y      33     +0.02   0.13    

     RxA    Z      49     -0.13   0.09
            X      39     +0.06   0.22
            Y      38     +0.05   0.12

     RxB    Z      36     -0.13   0.08    4
            X      30     +0.03   0.17
            Y      30     +0.10   0.15

Notes : 1 : SCUBA_Z = (-0.30 +- 0.06 )*sin(el)     with curvature 
        2 : SCUBA_Z = (0.010 +- 0.003)*Tleg   1.lt.T.lt.11   
        3 : SCUBA_X = (0.035 +- 0.009)*Tleg   1.lt.T.lt.11   rms 0.13
        4 : RxB_Z   = (0.017 +- 0.005)*Tleg   1.lt.T.lt.10

Again (see September/October), SCUBA_Z is significantly a function of elevation : it's about time this was sorted.

Combining the last 4 months focus data :

      FE  axis  No.obs.    mean   s.d.  Notes
                           (mm)   (mm)
                                                                        
    SCUBA   Z     279     -0.08   0.09    5,6,7
     RxA    Z     284     -0.08   0.09    8,9,10

Notes : 5 : SCUBA_Z =  0.09 + (-0.21 +- 0.04 )*sin(el)         
        6 : SCUBA_Z =  0.02 + (-0.15 +- 0.03 )*sin(el)*sin(el) 
        7 : SCUBA_Z = -0.13 + (0.009 +- 0.002)*Tleg   1.lt.T.lt.15
        8 :  RxA_Z  =  0.04 + (-0.16 +- 0.04 )*sin(el)
        9 :  RxA_Z  = -0.01 + (-0.12 +- 0.03 )*sin(el)*sin(el)
       10 :  RxA_Z  = -0.13 + (0.007 +- 0.002)*Tleg   0.lt.T.lt.15 

All fits reduce the s.d. from 0.09 to about 0.085.
Relationship #6 is the most significant (at about 6sigma).
We should maybe change the SMU parameters ZA and ZA_SCUBA; from +0.54 to +0.33 ,
or better (?) ZC and ZC_SCUBA; from +0.84(5) to +0.70
(Done: 20041228 - but later (20050124) discovered not to have been implemented due to having been placed in the wrong software plane ! Correctly installed on that later date).
This latter will also have the least impact on the zero-point.

Recall that

            Z = ZB + ZA*sin(el) + ZC*sin(el)*sin(el)
with
          ZB = -12.53mm, ZA = 0.54, ZC = 0.845  currently.

            SCUBA_Z = -0.36 +(1.05 +- 0.04 )*sin(el) (s.d = 0.09)

so it might be better (eventually ?) to withdraw ZC (set it to zero) and change ZA to +1.59, ZB to -12.89mm.