{TAIL ~ At least a portion} of {HEAD ~ the member} is in thermal contact with the opening and is made of a material reactive with electromagnetic energy 
{ TAIL ~ At least a portion } of { HEAD ~ the member } is in thermal contact with the opening and is made of a material reactive with electromagnetic energy
TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH