{HEAD ~ Size deviation} can be measured as root mean square of the diameter, with {TAIL ~ less than about 10% root} mean square being preferred 
{ HEAD ~ Size deviation } can be measured as root mean square of the diameter , with { TAIL ~ less than about 10 % root } mean square being preferred
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH