Slit   Filter      V      X         U              Signal              
                    deg     mm       deg    sig    nV-s   sig 
  None   None     182.55  41.62     60.05  0.004   101.2  1.2       
  None   Pyrex    182.55  41.63     60.11  0.003    56.8  0.4
  None   Sapphire 182.55  41.62     60.09  0.001    82.1  0.6
  None   7um      182.55  41.62     60.08  0.010     8.3  0.2

  Yes    None     182.75  41.60     59.65  0.004    17.4  0.1
Note:  Unidex spontaneous reset occured  Slit-Nofilter remeasured
  Yes    None     182.75  41.60     60.22  0.019    11.2  0.9
  Yes    7um      182.55  41.62     60.20  0.060     2.0  0.7
  Yes    Sapphire 182.55  41.62     60.18  0.008     8.5  0.4
  Yes    Pyrex    182.55  41.62     60.20  0.016     7.1  0.4