{TAIL ~ A solid material} or combination of materials is evaporated in {HEAD ~ the chamber} to form vapor 
{ TAIL ~ A solid material } or combination of materials is evaporated in { HEAD ~ the chamber } to form vapor
TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH