{HEAD ~ The steam boiler} operates at {TAIL ~ a pressure} above that needed for consumption in the process chamber and uses highly purified water 
operates at
{ HEAD ~ The steam boiler } operates at { TAIL ~ a pressure } above that needed for consumption in the process chamber and uses highly purified water
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH