{HEAD ~ The upstream volume} 66 is in {TAIL ~ direct fluid communication} with the coolant inlet 40, and the downstream volume 68 is in direct fluid communication with the coolant outlet 42 
is in
{ HEAD ~ The upstream volume } 66 is in { TAIL ~ direct fluid communication } with the coolant inlet 40 , and the downstream volume 68 is in direct fluid communication with the coolant outlet 42
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH