How to figure out the aspect ratio?

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sjm1027

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I read about 10:1 , 6:1 aspect ratio but I don't understand how it works. Can someone explain how you figure out the aspect ratio on a design with a board thickness of .093 and via hole size of .010 I don't know how to get the 6:1 number

Is it the board thickness devided by smallest hole size? If so how does 6:1 or 10:1 get figured in

Thanks
 

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