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[ATM] Ronchi Question

Hello everyone,

I have been working on figuring my mirror and I have found that when
using the Ronchi test that I see three images of my mirror that are
offset left and right by about 1/8"-1/4".  I have seen many pictures of
Ronchi tests where this occurs so I assume that it is fairly common.  I
have also seen pictures were it doesn't occur.  What causes this
phenomenon and how do I get rid of it?   

Thanks,
Dan 
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