{TAIL ~ A removable, replaceable ring} at the lower opening of the processing chamber allows process pumping speed to be tailored for {HEAD ~ different processes} by replacing the ring 
{ TAIL ~ A removable , replaceable ring } at the lower opening of the processing chamber allows process pumping speed to be tailored for { HEAD ~ different processes } by replacing the ring
TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH