There can never be any really hard numbers Bill, because  variables are many 
and the devil is always in the details. 
 
That aside, 1.5 cents per layer square inch is a number that has popped up  
often in the past. 
 
With that as a ranging round, we might see some more accurate rounds lobbed  
in landing a bit closer to the target.... ;-)
 
Kind regards, 
Joe  
 
 

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