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