Thus, the highest frequency maintenance component, the nozzle, is removed without moving or removing any other component in {HEAD ~ the chamber}, such as {TAIL ~ the mirror} 
such as
Thus , the highest frequency maintenance component , the nozzle , is removed without moving or removing any other component in { HEAD ~ the chamber } , such as { TAIL ~ the mirror }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL