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    Re: Measuring (and Calculating) Dip
    From: Paul Hirose
    Date: 2013 Mar 11, 08:12 -0700

    I wrote:
    > If you change faces, the effect
    > of index error has the same magnitude but opposite sign. Thus, the
    > difference of the face left and face right readings is the index error,
    > and the mean is free of index error.
    
    Correction: the difference between face left and face right is TWICE the
    index error.
    
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