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    Re: Instumental error?
    From: Alexandre Eremenko
    Date: 2005 Apr 20, 20:40 -0500

    Bill,
    > I have two observations:
    > 1.  It seems the SNO-T is a high-quality instrument.
    > If I recall, the specs
    > are plus/minus 10 seconds error along the arc (0.17').
    > Unless you got a
    > dud, any value higher than 0.2' is highly suspect.
    
    Yes, I afraid it is a dud.
    
    > 2.  Are you using the same star pairs when you get the 0.5', 0.6',
    > and 0.8'
    > values?
    
    I don't understand the question.
    On the same pair of stars the measurement are consistent.
    Stand dev is about 0.2'
    But you cannot measure substantially
    different distances with a same pair of stars.
    
    > Think we need to get together in a
    > more controlled setting with fresh eyes
    > and do some comparisons,
    
    Sure. I agree that more observations are necessary
    to develop a reliable table.
    
    So far it seems that only the very fact that such table
    is necessary is established.
    
    A
    
    
    

       
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