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In the example below, the white box is the centering window. The centering window has been 
set to 20% left, 30% right, 8% top, and 25% bottom. Since Bar Code 1 passes through the 
centering window, it will be read. Bar Code 2 does not pass through the centering window, so it 
will not be read. 
 
 
Note: A bar code needs only to be touched by the centering window in order to be read. It does 
not need to pass completely through the centering window.