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