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