The body and the shroud define {HEAD ~ an impeller chamber} including a radially inner surface and {TAIL ~ a radially outer surface} 
including
The body and the shroud define { HEAD ~ an impeller chamber } including a radially inner surface and { TAIL ~ a radially outer surface }
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL