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