{HEAD ~ the pressure determination system} is operable to determine {TAIL ~ the pressure values} by determining a first pressure value and a second pressure value of the fluid at a first time and a second time, respectively, during the oscillation of the pressure, and 
is operable to determine
{ HEAD ~ the pressure determination system } is operable to determine { TAIL ~ the pressure values } by determining a first pressure value and a second pressure value of the fluid at a first time and a second time , respectively , during the oscillation of the pressure , and
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL 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 OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH