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			The depth of the Touch is partly there for the IR beam system that detects your finger.  If I read the Paperwhite correctly it does not use IR but rather a capacitive layer.  So the bezel-to-screen depth could be shorter.  Good and bad since another semi-transparent layer is not known to enhance contrast (see earlier Sony touch readers before they went to IR).
		 
		
	
		
		
		
		
		
		
		
		
		
		
	
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