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