A controller 64 provides {HEAD ~ signals} to {TAIL ~ flow controllers} 54, 55, 56, 61 and 62 and pump 38 
to
A controller 64 provides { HEAD ~ signals } to { TAIL ~ flow controllers } 54 , 55 , 56 , 61 and 62 and pump 38
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH