{TAIL ~ A method} 1 wherein said spot diameter is smaller than {HEAD ~ 50 micrometer} 
{ TAIL ~ A method } 1 wherein said spot diameter is smaller than { HEAD ~ 50 micrometer }
TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD