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