According to the method, the temperature within the chamber is raised to {HEAD ~ a predetermined level} by energizing {TAIL ~ the heating elements} 
According to the method , the temperature within the chamber is raised to { HEAD ~ a predetermined level } by energizing { TAIL ~ the heating elements }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL