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