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