FIG 1 illustrates {TAIL ~ these active mud pits P1}, P2, and {HEAD ~ P3} fluidly connected in series 
FIG 1 illustrates { TAIL ~ these active mud pits P1 } , P2 , and { HEAD ~ P3 } fluidly connected in series
OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH