{TAIL ~ The typical particle size} is from about 0.7 to about 0.8 micrometers in {HEAD ~ mean diameter} 
{ TAIL ~ The typical particle size } is from about 0.7 to about 0.8 micrometers in { HEAD ~ mean diameter }
TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD