From: luweitest@address.invalid   
      
   On 2015-12-10 22:40, Helpful person wrote:   
   >   
   > The only possibility that comes to mind is that there may be some wedge or   
   power in your sample.   
   >   
   The sample is 0.55mm low iron soda-lime float glass, no coating, no any   
   structure. Both front and back surfaces are flat, and parallel I think.   
      
   --   
   Regards,   
   Lu Wei   
   PGP key ID: 0x92CCE1EA   
      
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